They used the Post-It Notes that are like accordions and made a bunch of awesomely choreographed videos. Most of it reminds me of Slinkys going down stairs and the like. It’s still awesome. If there’s one thing the EepyBird guys know how to do, it’s make a beautiful video.
They also have some nice How-To videos on how to make Pinwheels:
And another one on how to make Waterfalls:
Some good fun it looks like to me. However, that’s easily a few hundred dollars worth of sticky notes, better know someone who works at Staples or something…