diff --git a/Log.xcodeproj/project.pbxproj b/Log.xcodeproj/project.pbxproj
index 9f94c56..1f747d4 100644
--- a/Log.xcodeproj/project.pbxproj
+++ b/Log.xcodeproj/project.pbxproj
@@ -391,7 +391,7 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0720;
-				LastUpgradeCheck = 0820;
+				LastUpgradeCheck = 0930;
 				ORGANIZATIONNAME = delba;
 				TargetAttributes = {
 					6D7C68021C89FBAB005782C9 = {
@@ -411,11 +411,11 @@
 					};
 					6DACCA391C89F89D001B63D9 = {
 						CreatedOnToolsVersion = 7.2;
-						LastSwiftMigration = 0800;
+						LastSwiftMigration = 0930;
 					};
 					6DACCA421C89F89E001B63D9 = {
 						CreatedOnToolsVersion = 7.2;
-						LastSwiftMigration = 0800;
+						LastSwiftMigration = 0930;
 					};
 				};
 			};
@@ -604,14 +604,22 @@
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
 				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
 				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
@@ -655,14 +663,22 @@
 				CLANG_CXX_LIBRARY = "libc++";
 				CLANG_ENABLE_MODULES = YES;
 				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
 				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
@@ -793,6 +809,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "io.delba.Log-tvOSTests";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = appletvos;
+				SWIFT_SWIFT3_OBJC_INFERENCE = Default;
 				TVOS_DEPLOYMENT_TARGET = 9.1;
 			};
 			name = Debug;
@@ -806,6 +823,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = appletvos;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
+				SWIFT_SWIFT3_OBJC_INFERENCE = Default;
 				TVOS_DEPLOYMENT_TARGET = 9.1;
 			};
 			name = Release;
@@ -871,6 +889,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "io.delba.Log-OSXTests";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = macosx;
+				SWIFT_SWIFT3_OBJC_INFERENCE = Default;
 			};
 			name = Debug;
 		};
@@ -887,6 +906,7 @@
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SDKROOT = macosx;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
+				SWIFT_SWIFT3_OBJC_INFERENCE = Default;
 			};
 			name = Release;
 		};
@@ -907,7 +927,8 @@
 				PRODUCT_BUNDLE_IDENTIFIER = io.delba.Log;
 				PRODUCT_NAME = Log;
 				SKIP_INSTALL = YES;
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = Default;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -929,7 +950,8 @@
 				PRODUCT_NAME = Log;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = Default;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
@@ -941,7 +963,8 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = "io.delba.Log-iOSTests";
 				PRODUCT_NAME = "$(TARGET_NAME)";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = Default;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Debug;
 		};
@@ -954,7 +977,8 @@
 				PRODUCT_BUNDLE_IDENTIFIER = "io.delba.Log-iOSTests";
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
-				SWIFT_VERSION = 3.0;
+				SWIFT_SWIFT3_OBJC_INFERENCE = Default;
+				SWIFT_VERSION = 4.0;
 			};
 			name = Release;
 		};
diff --git a/Log.xcodeproj/xcshareddata/xcschemes/Log OSX.xcscheme b/Log.xcodeproj/xcshareddata/xcschemes/Log OSX.xcscheme
index 74625de..786458c 100644
--- a/Log.xcodeproj/xcshareddata/xcschemes/Log OSX.xcscheme	
+++ b/Log.xcodeproj/xcshareddata/xcschemes/Log OSX.xcscheme	
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0820"
+   LastUpgradeVersion = "0930"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
diff --git a/Log.xcodeproj/xcshareddata/xcschemes/Log iOS.xcscheme b/Log.xcodeproj/xcshareddata/xcschemes/Log iOS.xcscheme
index 22242b5..0587fe6 100644
--- a/Log.xcodeproj/xcshareddata/xcschemes/Log iOS.xcscheme	
+++ b/Log.xcodeproj/xcshareddata/xcschemes/Log iOS.xcscheme	
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0820"
+   LastUpgradeVersion = "0930"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
diff --git a/Log.xcodeproj/xcshareddata/xcschemes/Log tvOS.xcscheme b/Log.xcodeproj/xcshareddata/xcschemes/Log tvOS.xcscheme
index 974c403..70ad46d 100644
--- a/Log.xcodeproj/xcshareddata/xcschemes/Log tvOS.xcscheme	
+++ b/Log.xcodeproj/xcshareddata/xcschemes/Log tvOS.xcscheme	
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0820"
+   LastUpgradeVersion = "0930"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
diff --git a/Log.xcodeproj/xcshareddata/xcschemes/Log watchOS.xcscheme b/Log.xcodeproj/xcshareddata/xcschemes/Log watchOS.xcscheme
index 0a99541..2884ce9 100644
--- a/Log.xcodeproj/xcshareddata/xcschemes/Log watchOS.xcscheme	
+++ b/Log.xcodeproj/xcshareddata/xcschemes/Log watchOS.xcscheme	
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0820"
+   LastUpgradeVersion = "0930"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
diff --git a/Source/Extensions/Themes.swift b/Source/Extensions/Themes.swift
index 9ab16bb..561ff65 100644
--- a/Source/Extensions/Themes.swift
+++ b/Source/Extensions/Themes.swift
@@ -24,58 +24,66 @@
 
 extension Themes {
     public static let `default` = Theme(
-        trace:   "#C8C8C8",
-        debug:   "#0000FF",
-        info:    "#00FF00",
-        warning: "#FFFB00",
-        error:   "#FF0000"
+        trace:   Theme.Style(color: "#C8C8C8"),
+        debug:   Theme.Style(color: "#0000FF"),
+        info:    Theme.Style(color: "#00FF00"),
+        warning: Theme.Style(color: "#FFFB00"),
+        error:   Theme.Style(color: "#FF0000")
     )
     
     public static let dusk = Theme(
-        trace:   "#FFFFFF",
-        debug:   "#526EDA",
-        info:    "#93C96A",
-        warning: "#D28F5A",
-        error:   "#E44347"
+        trace:   Theme.Style(color: "#FFFFFF"),
+        debug:   Theme.Style(color: "#526EDA"),
+        info:    Theme.Style(color: "#93C96A"),
+        warning: Theme.Style(color: "#D28F5A"),
+        error:   Theme.Style(color: "#E44347")
     )
     
     public static let midnight = Theme(
-        trace:   "#FFFFFF",
-        debug:   "#527EFF",
-        info:    "#08FA95",
-        warning: "#EB905A",
-        error:   "#FF4647"
+        trace:   Theme.Style(color: "#FFFFFF"),
+        debug:   Theme.Style(color: "#527EFF"),
+        info:    Theme.Style(color: "#08FA95"),
+        warning: Theme.Style(color: "#EB905A"),
+        error:   Theme.Style(color: "#FF4647")
     )
     
     public static let tomorrow = Theme(
-        trace:   "#4D4D4C",
-        debug:   "#4271AE",
-        info:    "#718C00",
-        warning: "#EAB700",
-        error:   "#C82829"
+        trace:   Theme.Style(color: "#4D4D4C"),
+        debug:   Theme.Style(color: "#4271AE"),
+        info:    Theme.Style(color: "#718C00"),
+        warning: Theme.Style(color: "#EAB700"),
+        error:   Theme.Style(color: "#C82829")
     )
     
     public static let tomorrowNight = Theme(
-        trace:   "#C5C8C6",
-        debug:   "#81A2BE",
-        info:    "#B5BD68",
-        warning: "#F0C674",
-        error:   "#CC6666"
+        trace:   Theme.Style(color: "#C5C8C6"),
+        debug:   Theme.Style(color: "#81A2BE"),
+        info:    Theme.Style(color: "#B5BD68"),
+        warning: Theme.Style(color: "#F0C674"),
+        error:   Theme.Style(color: "#CC6666")
     )
     
     public static let tomorrowNightEighties = Theme(
-        trace:   "#CCCCCC",
-        debug:   "#6699CC",
-        info:    "#99CC99",
-        warning: "#FFCC66",
-        error:   "#F2777A"
+        trace:   Theme.Style(color: "#CCCCCC"),
+        debug:   Theme.Style(color: "#6699CC"),
+        info:    Theme.Style(color: "#99CC99"),
+        warning: Theme.Style(color: "#FFCC66"),
+        error:   Theme.Style(color: "#F2777A")
     )
     
     public static let tomorrowNightBright = Theme(
-        trace:   "#EAEAEA",
-        debug:   "#7AA6DA",
-        info:    "#B9CA4A",
-        warning: "#E7C547",
-        error:   "#D54E53"
+        trace:   Theme.Style(color: "#EAEAEA"),
+        debug:   Theme.Style(color: "#7AA6DA"),
+        info:    Theme.Style(color: "#B9CA4A"),
+        warning: Theme.Style(color: "#E7C547"),
+        error:   Theme.Style(color: "#D54E53")
+    )
+
+    public static let emojiHearts = Theme(
+        trace: Theme.Style(emoji: "💚"),
+        debug: Theme.Style(emoji: "🖤"),
+        info: Theme.Style(emoji: "💙"),
+        warning: Theme.Style(emoji: "💛"),
+        error: Theme.Style(emoji: "❤️")
     )
 }
diff --git a/Source/Formatter.swift b/Source/Formatter.swift
index d4b5a60..799572e 100644
--- a/Source/Formatter.swift
+++ b/Source/Formatter.swift
@@ -222,11 +222,18 @@ private extension Formatter {
      */
     func format(level: Level) -> String {
         let text = level.description
-        
-        if let color = logger.theme?.colors[level] {
-            return text.withColor(color)
+
+        if let style = logger.theme.style(for: level) {
+
+            var string = style.emoji + text
+
+            if let color = style.color {
+                string = string.withColor(color)
+            }
+
+            return string
         }
-        
+
         return text
     }
     
@@ -239,11 +246,14 @@ private extension Formatter {
      */
     func format(description: String?) -> String {
         var text = "MEASURE"
-        
-        if let color = logger.theme?.colors[.debug] {
-            text = text.withColor(color)
+
+        if let style = logger.theme.style(for: .debug) {
+
+            text = style.emoji + text
+            if let color = style.color {
+                text = text.withColor(color)
+            }
         }
-        
         if let description = description {
             text = "\(text) \(description)"
         }
diff --git a/Source/Logger.swift b/Source/Logger.swift
index 2e2920b..47fd6f6 100644
--- a/Source/Logger.swift
+++ b/Source/Logger.swift
@@ -52,7 +52,7 @@ open class Logger {
     }
     
     /// The logger theme.
-    public var theme: Theme?
+    public var theme: Theme
     
     /// The minimum level of severity.
     public var minLevel: Level
@@ -64,7 +64,7 @@ open class Logger {
     
     /// The logger colors
     public var colors: String {
-        return theme?.description ?? ""
+        return theme.description
     }
     
     /// The queue used for logging.
@@ -79,7 +79,7 @@ open class Logger {
      
      - returns: A newly created logger.
      */
-    public init(formatter: Formatter = .default, theme: Theme? = nil, minLevel: Level = .trace) {
+    public init(formatter: Formatter = .default, theme: Theme = .emojiHearts, minLevel: Level = .trace) {
         self.formatter = formatter
         self.theme = theme
         self.minLevel = minLevel
diff --git a/Source/Theme.swift b/Source/Theme.swift
index 221289c..ac4f800 100644
--- a/Source/Theme.swift
+++ b/Source/Theme.swift
@@ -25,13 +25,56 @@
 public class Themes {}
 
 public class Theme: Themes {
-    /// The theme colors.
-    internal var colors: [Level: String]
-    
+
+    /// Style object to hold color and emoji for each level.
+    public struct Style {
+
+        /// Color for the syyle.
+        public let color: String?
+        /// Emoji for the style.
+        public let emoji: String
+
+        /**
+         Creates and returns a style with the specified color or/and emoji.
+
+         - parameter coloe:   The color for the style.
+         - parameter debug:   The emoji for the style.
+
+         - returns: A style with the specified color or/and emoji.
+         */
+        public init(color: String? = nil, emoji: String? = nil) {
+
+            self.color = color
+            if let emoji = emoji {
+                self.emoji = emoji + " "
+            } else {
+                self.emoji = ""
+            }
+        }
+    }
+
+    /// The theme styles.
+    private var styles: [Level: Style]
+
+    /**
+     Returns style for the specified level.
+
+     - parameter level:   The level for which style needs to be selected.
+
+     - returns: A style for specific level.
+     */
+    internal func style(for level: Level) -> Style? {
+        return styles[level]
+    }
+
     /// The theme textual representation.
     internal var description: String {
-        return colors.keys.sorted().map {
-            $0.description.withColor(colors[$0]!)
+        return styles.keys.sorted().map {
+            var string = (styles[$0]?.emoji ?? "") + $0.description
+            if let color = styles[$0]?.color {
+                string = string.withColor(color)
+            }
+            return string
         }.joined(separator: " ")
     }
     
@@ -45,17 +88,49 @@ public class Theme: Themes {
      - parameter error:   The color for the error level.
      
      - returns: A theme with the specified colors.
+
+     - note: Deprecated. Use `init( trace: Style, debug: Style, info: Style, warning: Style, error: Style)` instead.
      */
+    @available(*, deprecated)
     public init(trace: String, debug: String, info: String, warning: String, error: String) {
-        self.colors = [
-            .trace:   Theme.formatHex(trace),
-            .debug:   Theme.formatHex(debug),
-            .info:    Theme.formatHex(info),
-            .warning: Theme.formatHex(warning),
-            .error:   Theme.formatHex(error)
+
+        self.styles = [
+            .trace:   Style(color: Theme.formatHex(trace)),
+            .debug:   Style(color: Theme.formatHex(debug)),
+            .info:    Style(color: Theme.formatHex(info)),
+            .warning: Style(color: Theme.formatHex(warning)),
+            .error:   Style(color: Theme.formatHex(error))
         ]
     }
-    
+
+    /**
+     Creates and returns a theme with the specified styles.
+
+     - parameter trace:   The style for the trace level.
+     - parameter debug:   The style for the debug level.
+     - parameter info:    The style for the info level.
+     - parameter warning: The style for the warning level.
+     - parameter error:   The style for the error level.
+
+     - returns: A theme with the specified styles.
+     */
+    public init(
+        trace: Style,
+        debug: Style,
+        info: Style,
+        warning: Style,
+        error: Style
+        ) {
+
+        self.styles = [
+            .trace: trace,
+            .debug: debug,
+            .info: info,
+            .warning: warning,
+            .error: error
+        ]
+    }
+
     /**
      Returns a string representation of the hex color.