Check out Radiant Mural by Martin Atkins a short 6 second film for the Adafruit #adafruit6secs electronic film festival (Youtube playlist here for all the entries on YouTube).
Featured Adafruit Products
RGB LED Weatherproof flexi-strip 60 LED – (1 m) – These LED strips are fun and glowy. There are 60 RGB LEDs per meter – twice as many as our other strip, and you can control the entire strip at once with any microcontroller and three transistors. The way they are wired, you will need a 9-12VDC power supply and then ground the R/G/B pins to turn on the three colors. Use any NPN or N-channel MOSFET (although the big powerful kind is good for a large strip) and PWM the inputs for color-mixing. (read more)