LED Art Fan
That is geeky to the max but still very creative. A perfect gift for any anime fan or gadget lover.
Designed by Guido Ooms; inside are 20 warm white high-intensity LEDs with an estimated 30,000 hour (10 year) lifespan. $120
So these are a bunch of little LEDs with attached magnets and you can throw them on a car or anything metal that you want to tag. But they warn you that you should only tag your own things.