I recently met Huong Ngo from the Graffiti Research Lab (GRL) at an Eyebeam event. She showed me her work on an open source graffiti technology project, "LED Throwies." Taking LEDs, batteries and magnets taped together, you can make a bunch of them and throw them onto anything ferromagnetic. LED Throwies are great because they are easy to make, not (too) expensive, and fun to use. Over the weekend during a panel on DYI culture, Mark Frauenfelder from Boing Boing and the magazine Maker, showed a clip from the Maker Faire of Huong demonstrating how to make Throwies. GRL also have had some public demonstrations / art happenings in New York to show you how its done.

Via Boing Boing