Must be on an LED kick today. The author uses a ATiny (arduino like) to drive some RGB LEDs, its a nice write-up and worth reading. I like using this over other CPUs since as the author points out, ATiny’s can be had for a dollar. Of course you could go cheaper with TI’s MSP’s….
http://www.instructables.com/id/Use-a-1-ATTiny-to-drive-addressable-RGB-LEDs/