John Park, host of Make: television, builds a TinyCylon LED kit from the Maker Shed, and uses it to light up a prop Nerf gun. Get a kit here: http://www.makershed.com/ProductDetails.asp?ProductCode=MKDW1
On Make: online http://blog.makezine.com/archive/2010/03/john_park_maker_shed_tinycylon.html