SpokePOV - Persistence of Vision for your Bike!

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 software for uploading and editing stored bitmap images, and a high-quality kit with all the parts necessary to build your own.”
Turn your bike into a public display/protest/work of art with homebrew electronics!

SpokePOV - Persistence of Vision for your Bike!
http://www.ladyada.net/make/spokepov/index.html