What?
Applies to Windows 7.
Requires a Vogonian environment of red tape and bureaucracy.

This is an article to describe an alternative method then "right-clicking on the desktop", "selecting Personalize", "clicking on Desktop Background", "browsing to the Picture Location". The problem happens when browsing to the picture location and it doesn't seem to remember which folder you selected. At home, this would be a breeze, but that's because I don't implement group policies at home.

Why?
We get problems with this because none of our staff are full administrators of their local workstation. As IT staff we have elevated privileges but not absolute rights to configuring our computer. And we still need to re-login for every change. About a zillion group policies control our every deviation from the standard staff image and so we spend more time on "how do you make it like it was in XP?" situations.

How?
Who doesn't want to change their desktop background wallpaper? Using Windows 7, who doesn't want it to be a slideshow as well?

1. Create a folder in your “My Pictures” folder in your home drive (check that this is the one on the homedrive and preferably not C:\ drive). I’ve called mine “Win7_ScrSvr”.
2. Copy a few background images into the folder.
3. Right-click on one of the images and select “Set as Background”
4. Right-click on the desktop and select “Personalize” and
5. Click on “Desktop Background” (one of the 4 options at the bottom)
6. Check the Picture location is using your image folder and click on “Select All”
7. Click on “Save Changes”

Additional:
Further group policies can completely disable this feature so there is a chance that this won't work for you.