Rafael Mizrahi created illuminated clothing using addressable LEDs. This video shows about 300 WS2811 LEDs going up to 30 frames per second. Addressable LEDs really make for some amazing costumes.
Syphon, and open source technology for Mac OS X, was used to transfer video frames from Resolume to a Teensy though serial output. The Teensy then drove the LEDs.
More information on the project can be found on Rafael’s blog.