Heh, I can't wait for the day one of user/student at the school I admin posts something like that here! hehe...

BTW, you might think changing the background to some innocent picture should be fine, but I promise you that if we (school admins) were to allow that, it would take less than a week (heck, the first day) for someone to leave inapropriate content (pr0n, hate, whatever) on a desktop just before he leaves. Can you imagine us (school admins) having to report to the principal (or whomever) as of why this was allowed to happen, after parents start calling in in outrage?!

Ammo