Spoke POV is an easy-to-make electronic kit toy that turns your bicycle wheel into a customized display! The project includes a free schematic design, open source software for uploading and editing stored bitmap images, and a high-quality kit with all the parts necessary to build your own.
Tired: A red blinker on your seatpost
Wired: Programmable full-wheel images in any color
[Step by step HOWTO]