While we were teaching at Red Hat High, Sam Brubaker (Rocketman) decided that he was going to release the .blend file to his animation, Infinitum, under a Creative Commons license. Infinitum won the 2006 Suzanne Award for "Best Animation, original idea, or story". He has chosen the Creative Commons Attribution-Noncommericial license 3.0.
Get the Infinitum .blend file (right-click and Save As). Have fun!