Done entirely with Post-It notes.

This is brilliant. And perverse.

I see you one, and raise you one.

It took 25k post-its to make the following music video: http://www.geekosystem.com/family-bones-post-it-notes/

Tetris, anyone?

Disney, 25k pieces of paper, and a 10 foot wall, via Boing Boing: http://www.petapixel.com/2010/02/26/stop-motion-post-it-animation-by-disney/