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Description:  

Specifies the desktop background ("wallpaper") displayed on all users' desktops.

This setting lets you specify the wallpaper on users' desktops and prevents users from changing the image
or its presentation. The wallpaper you specify can be stored in a bitmap (*.bmp) or JPEG (*.jpg) file.

To use this setting, type the fully qualified path and name of the file that stores the wallpaper image. You can
type a local path, such as C:\Windows\web\wallpaper\home.jpg or a UNC path, such as \\Server\Share
\Corp.jpg. If the specified file is not available when the user logs on, no wallpaper is displayed. Users cannot
specify alternative wallpaper. You can also use this setting to specify that the wallpaper image be centered,
tiled, or stretched. Users cannot change this specification.

If you disable this setting or do not configure it, no wallpaper is displayed. However, users can select the
wallpaper of their choice.

Also, see the "Allow only bitmapped wallpaper" in the same location, and the "Prevent changing wallpaper"
setting in User Configuration\Administrative Templates\Control Panel.

Note: This setting does not apply to remote desktop server sessions.

Supported on: At least Windows 2000.
Desktop Wallpaper
Description Gpedit Regedit CMD Back VBScript PowerShell Script
Gpedit:   

Please perform the following steps:

Please go to Pearl button (Start) and click on the Search programs and files
For more information about the change from Start to Pearl button click here
Type gpedit.msc and press Enter
In the Group Policy window please navigate to User Configuration -> Administrative Templates ->
Desktop -> Desktop and open Desktop Wallpaper.
Not Configured -> is the Default state
Enabled -> apply this GPO
Disabled -> this GPO will not be applied

To finish press ok button and close Group Policy window.
Type regedit and press ok
Please confirm User Account Control pop-up
Microsoft official disclaimer

Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by
using another method. These problems might require that you reinstall the operating system. Microsoft
cannot guarantee that these problems can be solved. Modify the registry at your own risk.

Note: This registry key is created by Group Policy when this GPO is Enable. The GPO Default state is Not
Configured -> this registry entry is not present. For Disable this registry entry is not present.

Please navigate to HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies
\System
and locate Wallpaper registry key
Regedit:          

Please perform the following steps:

Please go to Pearl button (Start) and click on the Search programs and files
For more information about the change from Start to Pearl button click here
   
   
Double click on Wallpaper and edit the value:

To Enable:
Change the data value with:
Wallpaper = "C:\windows\web\wallpaper\home.jpg"

WallpaperStyle =

Center = 0
Fill = 4
Fit = 3
Stretch = 2
Tile = 1

To finish press ok button and close Registry Editor window

Note: Manual editing of this registry key will not be reflected in Group Policy. If you modify this GPO from
Group Policy this registry key will be rewritten.
Type cmd, right click on cmd icon under the Programs and click on Run as administrator
Please confirm User Account Control pop-up
Please select, right and copy a registry key from below, then right click on command prompt window
, select Paste and press Enter

Enabled:
REG add "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System" /v Wallpaper /t REG_SZ /d "C:\windows\web\wallpaper\home.jpg" /f
REG add "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System" /v WallpaperStyle /t REG_SZ /d "0" /f

Not Configured:
REG DELETE "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System" /v Wallpaper /f
REG DELETE "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System" /v WallpaperStyle /f

Note: Manual editing of this registry key will not be reflected in Group Policy. If you modify this GPO from
Group Policy this registry key will be rewritten.
CMD:          

Please perform the following steps:

Please go to Pearl button (Start) and click on the Search programs and files
For more information about the change from Start to Pearl button click here
   
VBScript:          

Const HKEY_CURRENT_USER = &H80000001
strComputer = "."
Set oReg=GetObject("winmgmts:{impersonationLevel=impersonate}!\\" & _
strComputer & "\root\default:StdRegProv")

strKeyPath = "Software\Microsoft\Windows\CurrentVersion\Policies\System"
oReg.CreateKey HKEY_CURRENT_USER,strKeyPath
strValueName1 = "Wallpaper"
strValueName2 = "WallpaperStyle"
'Enabled
strValue1 = "C:\windows\web\wallpaper\home.jpg"
strValue2 = cstr("0")
oReg.SetStringValue HKEY_CURRENT_USER,strKeyPath,strValueName1,strValue1
oReg.SetStringValue HKEY_CURRENT_USER,strKeyPath,strValueName2,strValue2
'Not Configured
'oReg.DeleteValue HKEY_CURRENT_USER,strKeyPath,strValueName
   
PowerShell Script :          

Enabled

$RegKey = "HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies"
If(Test-Path ($RegKey + "\System"))
{
 $RegKey = "HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\System"
  ##Enabled
  New-ItemProperty -path $RegKey -name Wallpaper -value "C:\windows\web\wallpaper\home.jpg" -PropertyType String -Force
  New-ItemProperty -path $RegKey -name WallpaperStyle -value "0" -PropertyType String -Force
}
else
{
 New-Item -path $RegKey -name System
 $RegKey = "HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies\System"
  ##Enabled
  New-ItemProperty -path $RegKey -name Wallpaper -value "C:\windows\web\wallpaper\home.jpg" -PropertyType String -Force
  New-ItemProperty -path $RegKey -name WallpaperStyle -value "0" -PropertyType String -Force
}

Not Configured\Disabled

$RegKey = "HKCU:\Software\Microsoft\Windows\CurrentVersion\Policies"
Remove-ItemProperty -Path($RegKey + "\Explorer") -name NoActiveDesktopChanges
If( (Get-Item -Path($RegKey + "\Explorer")).ValueCount -eq 0 -and (Get-Item -Path($RegKey + "\Explorer")).SubKeyCount -eq 0)
{
 Remove-Item -Path($RegKey + "\Explorer")  
}
   
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Result:

Need test pictures.
Verify code.
Result