The Sparkle Shield is an add-on shield for Arduino that has 70 individually programmable full color LEDs arranged in a 7x10 matrix. It comes as an unassembled kit that you can solder yourself with a few basic tools. The Sparkle Shield comes with a bunch of cool animations, but it's also easy to program your own using the free Arduino development kit (compatible with PC/Mac/Linux) and the Sparkle Shield Arduino library. For more information and assembly and programming instructions, go to http://sparkleshield.com.