The Rasterbator
The scourge of university IT paper consumption worldwide, The Rasterbator, has existed in one form or another since 2004. It started at the now defunct artsy site of general weirdness homokaasu.org and there is also the standalone version. The Rasterbator is provided for your pleasure and convinience by Matias Ärje, an Internet enthusiast and connoisseur.
This would be a great resource for art in the afternoon, bulletin boards, or patrons with art projects. Check it out at http://rasterbator.net/. Thanks to Jennifer for sharing this awesome free resource!