Most Green Lantern rings are about as lame as the movie, but you can make yours glow with a little bit of hacking as described in this great Instructable by Multi-Bot. Of course, you'll have to wait until 3D printing gets a lot better before you can use it to make a gun or sledgehammer to wipe out your enemies.
Tokyoflash Treasure Hunt - Win a Tokyoflash Watch of Your Choice!
Going on right now: Tokyoflash Treasure Hunt #26. Win a Tokyoflash watch and neat stuff from the NeatoShop. It's fun and easy to play: Link