diff --git a/devussy-web/src/app/globals.css b/devussy-web/src/app/globals.css
index 5cdef37..145d113 100644
--- a/devussy-web/src/app/globals.css
+++ b/devussy-web/src/app/globals.css
@@ -115,6 +115,144 @@
   --sidebar-ring: oklch(0.65 0.25 265);
 }
 
+.forest {
+  --radius: 0.5rem;
+  --background: oklch(0.98 0.01 120);
+  --foreground: oklch(0.15 0.02 120);
+  --card: oklch(1 0 0);
+  --card-foreground: oklch(0.15 0.02 120);
+  --popover: oklch(1 0 0);
+  --popover-foreground: oklch(0.15 0.02 120);
+  --primary: oklch(0.35 0.15 145);
+  --primary-foreground: oklch(0.98 0 0);
+  --secondary: oklch(0.96 0.01 120);
+  --secondary-foreground: oklch(0.35 0.15 145);
+  --muted: oklch(0.96 0.01 120);
+  --muted-foreground: oklch(0.55 0.03 120);
+  --accent: oklch(0.96 0.01 120);
+  --accent-foreground: oklch(0.35 0.15 145);
+  --destructive: oklch(0.6 0.25 25);
+  --border: oklch(0.92 0.01 120);
+  --input: oklch(0.92 0.01 120);
+  --ring: oklch(0.35 0.15 145);
+  --chart-1: oklch(0.35 0.15 145);
+  --chart-2: oklch(0.45 0.2 170);
+  --chart-3: oklch(0.25 0.1 120);
+  --chart-4: oklch(0.55 0.15 190);
+  --chart-5: oklch(0.65 0.2 210);
+  --sidebar: oklch(0.98 0.01 120);
+  --sidebar-foreground: oklch(0.15 0.02 120);
+  --sidebar-primary: oklch(0.35 0.15 145);
+  --sidebar-primary-foreground: oklch(0.98 0 0);
+  --sidebar-accent: oklch(0.96 0.01 120);
+  --sidebar-accent-foreground: oklch(0.35 0.15 145);
+  --sidebar-border: oklch(0.92 0.01 120);
+  --sidebar-ring: oklch(0.35 0.15 145);
+}
+
+.dark.forest {
+  --background: oklch(0.2 0.05 140);
+  --foreground: oklch(0.98 0.02 140);
+  --card: oklch(0.15 0.06 140);
+  --card-foreground: oklch(0.98 0.02 140);
+  --popover: oklch(0.15 0.06 140);
+  --popover-foreground: oklch(0.98 0.02 140);
+  --primary: oklch(0.65 0.25 145);
+  --primary-foreground: oklch(0.10 0.05 140);
+  --secondary: oklch(0.25 0.10 140);
+  --secondary-foreground: oklch(0.98 0.02 140);
+  --muted: oklch(0.25 0.10 140);
+  --muted-foreground: oklch(0.70 0.05 140);
+  --accent: oklch(0.25 0.10 140);
+  --accent-foreground: oklch(0.98 0.02 140);
+  --destructive: oklch(0.6 0.25 25);
+  --border: oklch(0.30 0.10 140);
+  --input: oklch(0.30 0.10 140);
+  --ring: oklch(0.65 0.25 145);
+  --chart-1: oklch(0.65 0.25 145);
+  --chart-2: oklch(0.75 0.20 170);
+  --chart-3: oklch(0.55 0.25 120);
+  --chart-4: oklch(0.85 0.15 190);
+  --chart-5: oklch(0.90 0.10 210);
+  --sidebar: oklch(0.15 0.06 140);
+  --sidebar-foreground: oklch(0.98 0.02 140);
+  --sidebar-primary: oklch(0.65 0.25 145);
+  --sidebar-primary-foreground: oklch(0.10 0.05 140);
+  --sidebar-accent: oklch(0.25 0.10 140);
+  --sidebar-accent-foreground: oklch(0.98 0.02 140);
+  --sidebar-border: oklch(0.30 0.10 140);
+  --sidebar-ring: oklch(0.65 0.25 145);
+}
+
+.ocean {
+  --radius: 0.5rem;
+  --background: oklch(0.98 0.01 200);
+  --foreground: oklch(0.15 0.02 200);
+  --card: oklch(1 0 0);
+  --card-foreground: oklch(0.15 0.02 200);
+  --popover: oklch(1 0 0);
+  --popover-foreground: oklch(0.15 0.02 200);
+  --primary: oklch(0.35 0.15 225);
+  --primary-foreground: oklch(0.98 0 0);
+  --secondary: oklch(0.96 0.01 200);
+  --secondary-foreground: oklch(0.35 0.15 225);
+  --muted: oklch(0.96 0.01 200);
+  --muted-foreground: oklch(0.55 0.03 200);
+  --accent: oklch(0.96 0.01 200);
+  --accent-foreground: oklch(0.35 0.15 225);
+  --destructive: oklch(0.6 0.25 25);
+  --border: oklch(0.92 0.01 200);
+  --input: oklch(0.92 0.01 200);
+  --ring: oklch(0.35 0.15 225);
+  --chart-1: oklch(0.35 0.15 225);
+  --chart-2: oklch(0.45 0.2 250);
+  --chart-3: oklch(0.25 0.1 200);
+  --chart-4: oklch(0.55 0.15 270);
+  --chart-5: oklch(0.65 0.2 290);
+  --sidebar: oklch(0.98 0.01 200);
+  --sidebar-foreground: oklch(0.15 0.02 200);
+  --sidebar-primary: oklch(0.35 0.15 225);
+  --sidebar-primary-foreground: oklch(0.98 0 0);
+  --sidebar-accent: oklch(0.96 0.01 200);
+  --sidebar-accent-foreground: oklch(0.35 0.15 225);
+  --sidebar-border: oklch(0.92 0.01 200);
+  --sidebar-ring: oklch(0.35 0.15 225);
+}
+
+.dark.ocean {
+  --background: oklch(0.2 0.05 220);
+  --foreground: oklch(0.98 0.02 220);
+  --card: oklch(0.15 0.06 220);
+  --card-foreground: oklch(0.98 0.02 220);
+  --popover: oklch(0.15 0.06 220);
+  --popover-foreground: oklch(0.98 0.02 220);
+  --primary: oklch(0.65 0.25 225);
+  --primary-foreground: oklch(0.10 0.05 220);
+  --secondary: oklch(0.25 0.10 220);
+  --secondary-foreground: oklch(0.98 0.02 220);
+  --muted: oklch(0.25 0.10 220);
+  --muted-foreground: oklch(0.70 0.05 220);
+  --accent: oklch(0.25 0.10 220);
+  --accent-foreground: oklch(0.98 0.02 220);
+  --destructive: oklch(0.6 0.25 25);
+  --border: oklch(0.30 0.10 220);
+  --input: oklch(0.30 0.10 220);
+  --ring: oklch(0.65 0.25 225);
+  --chart-1: oklch(0.65 0.25 225);
+  --chart-2: oklch(0.75 0.20 250);
+  --chart-3: oklch(0.55 0.25 200);
+  --chart-4: oklch(0.85 0.15 270);
+  --chart-5: oklch(0.90 0.10 290);
+  --sidebar: oklch(0.15 0.06 220);
+  --sidebar-foreground: oklch(0.98 0.02 220);
+  --sidebar-primary: oklch(0.65 0.25 225);
+  --sidebar-primary-foreground: oklch(0.10 0.05 220);
+  --sidebar-accent: oklch(0.25 0.10 220);
+  --sidebar-accent-foreground: oklch(0.98 0.02 220);
+  --sidebar-border: oklch(0.30 0.10 220);
+  --sidebar-ring: oklch(0.65 0.25 225);
+}
+
 @layer base {
   * {
     @apply border-border;
diff --git a/devussy-web/src/app/layout.tsx b/devussy-web/src/app/layout.tsx
index c4565d6..50efafc 100644
--- a/devussy-web/src/app/layout.tsx
+++ b/devussy-web/src/app/layout.tsx
@@ -2,6 +2,8 @@ import type { Metadata } from "next";
 import { JetBrains_Mono } from "next/font/google";
 import "./globals.css";
 import { AppLayout } from "@/components/layout/AppLayout";
+import { ThemeProvider } from "@/components/ThemeProvider";
+import { ThemeScript } from "@/components/ThemeScript";
 
 const jetbrainsMono = JetBrains_Mono({ subsets: ["latin"] });
 
@@ -16,12 +18,17 @@ export default function RootLayout({
   children: React.ReactNode;
 }>) {
   return (
-    <html lang="en" className="dark">
+    <html lang="en">
+      <head>
+        <ThemeScript />
+      </head>
       <body className={`${jetbrainsMono.className} antialiased`}>
-        <div className="scanlines" />
-        <AppLayout>
-          {children}
-        </AppLayout>
+        <ThemeProvider>
+          <div className="scanlines" />
+          <AppLayout>
+            {children}
+          </AppLayout>
+        </ThemeProvider>
       </body>
     </html>
   );
diff --git a/devussy-web/src/components/ThemeProvider.tsx b/devussy-web/src/components/ThemeProvider.tsx
new file mode 100644
index 0000000..2290a88
--- /dev/null
+++ b/devussy-web/src/components/ThemeProvider.tsx
@@ -0,0 +1,74 @@
+"use client";
+
+import React, { createContext, useContext, useState, useEffect } from 'react';
+
+const themes = ["light", "dark", "forest", "dark forest", "ocean", "dark ocean"] as const;
+type Theme = typeof themes[number];
+
+interface ThemeProviderProps {
+  children: React.ReactNode;
+  defaultTheme?: Theme;
+  storageKey?: string;
+}
+
+interface ThemeProviderState {
+  theme: Theme;
+  setTheme: (theme: Theme) => void;
+  toggleTheme: () => void;
+}
+
+const ThemeProviderContext = createContext<ThemeProviderState | undefined>(undefined);
+
+export function ThemeProvider({
+  children,
+  defaultTheme = "dark",
+  storageKey = "devussy-web-theme",
+  ...props
+}: ThemeProviderProps) {
+  const [theme, setTheme] = useState<Theme>(() => {
+    try {
+      return (localStorage.getItem(storageKey) as Theme) || defaultTheme;
+    } catch (e) {
+      console.error("Failed to access localStorage:", e);
+      return defaultTheme;
+    }
+  });
+
+  useEffect(() => {
+    const root = window.document.documentElement;
+    root.className = theme.split(' ').join(' ');
+  }, [theme]);
+
+  const toggleTheme = () => {
+    const currentIndex = themes.indexOf(theme);
+    const nextIndex = (currentIndex + 1) % themes.length;
+    setTheme(themes[nextIndex]);
+  };
+
+  const value = {
+    theme,
+    setTheme: (newTheme: Theme) => {
+      try {
+        localStorage.setItem(storageKey, newTheme);
+      } catch (e) {
+        console.error("Failed to set theme in localStorage:", e);
+      }
+      setTheme(newTheme);
+    },
+    toggleTheme,
+  };
+
+  return (
+    <ThemeProviderContext.Provider {...props} value={value}>
+      {children}
+    </ThemeProviderContext.Provider>
+  );
+}
+
+export const useTheme = () => {
+  const context = useContext(ThemeProviderContext);
+  if (context === undefined) {
+    throw new Error("useTheme must be used within a ThemeProvider");
+  }
+  return context;
+};
diff --git a/devussy-web/src/components/ThemeScript.tsx b/devussy-web/src/components/ThemeScript.tsx
new file mode 100644
index 0000000..5d4a1da
--- /dev/null
+++ b/devussy-web/src/components/ThemeScript.tsx
@@ -0,0 +1,18 @@
+"use client";
+
+import React from 'react';
+
+const script = `
+(function() {
+  try {
+    const theme = localStorage.getItem('devussy-web-theme') || 'dark';
+    document.documentElement.className = theme.split(' ').join(' ');
+  } catch (e) {
+    console.error('Failed to apply theme from localStorage', e);
+  }
+})();
+`;
+
+export function ThemeScript() {
+  return <script dangerouslySetInnerHTML={{ __html: script }} />;
+}
diff --git a/devussy-web/src/components/window/Taskbar.tsx b/devussy-web/src/components/window/Taskbar.tsx
index 2cbbeda..cee32a5 100644
--- a/devussy-web/src/components/window/Taskbar.tsx
+++ b/devussy-web/src/components/window/Taskbar.tsx
@@ -2,7 +2,8 @@
 
 import React from 'react';
 import { cn } from "@/utils";
-import { Layout, HelpCircle, Plus } from "lucide-react";
+import { Layout, HelpCircle, Plus, Sun, Moon, TreePine, Waves } from "lucide-react";
+import { useTheme } from '../ThemeProvider';
 
 interface TaskbarProps {
     windows: Array<{ id: string; title: string; type: string }>;
@@ -21,12 +22,36 @@ export const Taskbar: React.FC<TaskbarProps> = ({
     onNewProject,
     onHelp
 }) => {
+    const { theme, toggleTheme } = useTheme();
+
+    const ThemeIcon = () => {
+        if (theme.includes('forest')) {
+            return <TreePine className="h-4 w-4" />;
+        }
+        if (theme.includes('ocean')) {
+            return <Waves className="h-4 w-4" />;
+        }
+        if (theme.includes('dark')) {
+            return <Moon className="h-4 w-4" />;
+        }
+        return <Sun className="h-4 w-4" />;
+    };
+
     return (
         <div className="fixed bottom-4 left-1/2 -translate-x-1/2 z-[100] flex items-center gap-2 p-2 rounded-xl bg-black/60 backdrop-blur-md border border-white/10 shadow-2xl transition-all hover:bg-black/70">
             <div className="px-2 border-r border-white/10 mr-1">
                 <Layout className="h-5 w-5 text-primary" />
             </div>
 
+            {/* Theme Toggle Button */}
+            <button
+                onClick={toggleTheme}
+                className="flex items-center gap-2 px-3 py-2 rounded-lg text-sm font-medium transition-all text-muted-foreground hover:bg-white/5 hover:text-white"
+                title="Toggle Theme"
+            >
+                <ThemeIcon />
+            </button>
+
             {/* New Project Button */}
             <button
                 onClick={onNewProject}