The Wind Light is an interesting device, not exactly my style though. They remind me of the deer whistles.

” * Light up by wind when car drives. No cable, and no batteries required
* Easy installation
* Stick or screw this wind light on any place of your car or motorcycle
* Motion activated, turns on automatically when you drive, turn off automatically when car stops
* Different light colors available: red, blue, yellow, green
* Compact design and light weight
* High intensity light increases visibility at night for safety
* Makes impressive effects
* Light weight
* Dimension: 73*35*25mm”