http://www.instructables.com/ex/i/3C...C001143E7E506/
I less than three this. It's even open-source and Linux-friendly.
I could just see the night riding possibilities now. I mean who could claim they "didn't see you" when your wheels look like this:
http://static.instructables.com/pub/...00b.medium.jpg
Okay, okay, so it's probably not very practical, but I thought it was too cool not to share . :D