EDIT: There’s an awesome video of Throwies being applied en masse to a building in NY over at VideoBomb.com.
OK, now this is a cool idea - temporary “graffiti” in the form of colorful magnetic LEDs, powered by tiny lithium cells for up to two weeks. Cost? About $1.00 per throwie, less with volume discounts on parts.

I love the Make Magazine blog and Instructables.com - they have so many cool, easy-to-do projects!
It’s a rad concept, and the video is beautiful…
But in two weeks, you have hundreds of dead throwies - will the Makers be good citizens and clean up appropriately? (and how you pull them down, I’m not even sure… ladder?)