Developed by the Graffiti Research Lab a division of the Eyebeam R&D OpenLab, LED Throwies are an inexpensive, yet ingenious way to add color to any ferromagnetic surface. A Throwie consists of a lithium battery, a 10mm diffused LED and a rare-earth magnet taped together. You then simply cast it into the outer darkness, as it were.

Anyone fancy a spot of guerilla marketing?