Windows Server: How to Force a Solid Background Color
To avoid the typical picture on the background of your desktop, use the following procedure to force a solid blue color as background:
Start the Group Policy Editor: gpedit.msc
Go to User Configuration > Administrative Templates > Desktop > Desktop
Open Desktop Wallpaper
Enable it and set the Wallpaper Name to:
C:\Windows\Web\Screen\img105.jpg
Click on OK to save the changes
While you could also just right-click on the desktop and choose Personalize and set a Read more [...]