desktop.ps1

(new-object System.Net.WebClient).DownloadFile('https://i2.kym-cdn.com/photos/images/original/000/948/404/183.png',"c:\temp\b.jpg");
<#
	(new-object System.Net.WebClient).DownloadFile('https://raw.githubusercontent.com/judge2020/judge2020-ws/master/b.jpg',"c:\temp\b.jpg");
	(new-object System.Net.WebClient).DownloadFile('https://wallimpex.com/data/out/773/nvidia-triple-monitor-wallpaper-11208855.jpg',"c:\temp\b.jpg");
#>


Function Set-WallPaper($Image) {
<#
.SYNOPSIS
Applies a specified wallpaper to the current user's desktop
   
.PARAMETER Image
Provide the exact path to the image
 
.EXAMPLE
Set-WallPaper -Image "C:\Wallpaper\Default.jpg"
 
#>
 
Add-Type -TypeDefinition @" 
using System; 
using System.Runtime.InteropServices;
 
public class Params
{ 
    [DllImport("User32.dll",CharSet=CharSet.Unicode)] 
    public static extern int SystemParametersInfo (Int32 uAction, 
                                                   Int32 uParam, 
                                                   String lpvParam, 
                                                   Int32 fuWinIni);
}
"@ 
 
$SPI_SETDESKWALLPAPER = 0x0014
$UpdateIniFile = 0x01
$SendChangeEvent = 0x02
 
$fWinIni = $UpdateIniFile -bor $SendChangeEvent
 
$ret = [Params]::SystemParametersInfo($SPI_SETDESKWALLPAPER, 0, $Image, $fWinIni)
}


Set-WallPaper -Image  "c:\temp\b.jpg"