As these blades spin during riding, a computer inside the blades modulates the internal LED lights so that design images and custom text appear. The user can decide how many spokes in a variety of colors they want to place on the bicycle wheel." - Hokey Spokes
Hokey Spokes are transparent "blades" that you can put on your bike spokes. As your wheels turn, the blades create designs and even text messages based on the internal computer. Wow.