windows

# Set image location variable
$img = "$env:TEMP\youvebeenbiebered.jpg"

# Download random image
Invoke-WebRequest 'https://bieber.party/today' -OutFile $img

# Always use Stretch style
$WallpaperStyle = "2"
$TileWallpaper = "0"

# Set background styles
New-ItemProperty -Path "HKCU:\Control Panel\Desktop" -Name WallpaperStyle -PropertyType String -Value $WallpaperStyle -Force
New-ItemProperty -Path "HKCU:\Control Panel\Desktop" -Name TileWallpaper -PropertyType String -Value $TileWallpaper -Force

Add-Type @"
using System;
using System.Runtime.InteropServices;

public class NativeMethods {
    [DllImport("user32.dll", CharSet = CharSet.Unicode)]
    public static extern int SystemParametersInfo(int uAction, int uParam, string lpvParam, int fuWinIni);
}
"@

# Apply background
[NativeMethods]::SystemParametersInfo(20, 0, $img, 3)