Dormitory's USB disco dancefloor

 Storborg Ddf Pics Rainbow
A group of MIT students built a 128 square foot light-up dancefloor in their dorm lounge. A total of 1,536 LEDs provide 4,096 colors and 30 frames/second. Of course, the whole display is programmable via USB. And yes, they plan to play Dance Dance Revolution on it. Link (via Slashdot)