My old friend Todd and various other people have put together LED throwies for the Graffiti Research Lab, who promise that they will have a website soon.
"Developed by the Graffiti Research Lab, LED Throwies are an inexpensive way to add color to any ferromagnetic surface in your neighborhood. A Throwie consists of a lithium battery, a 10mm diffused LED and a rare-earth magnet taped together. Throw it up high and in quantity to impress your friends and city officials."
Addendum: Aha. It is on instructables. Well, then.
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