Wallpaper distribution problem

Environment: Schools with Windows XP PCs, Server 2003 AD and GPO

Problem: Distributing common desktop to all computers

Have tried:
- GPO. Does not include all settings I need. If we use Active Desktop
settings, wallpaper is distributed, but shortcuts on the desktop looses
transparent view with shadows...
- Mandatory profile. Works fine except for desktop wallpaper. It will not
show up if the user is not administrator on local machine. We don't want
pupils til be local administrators, so they won't get any wallpaper...

Anyone having a better idea?

:-)
eva