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.
NEATOSHOP'S BLACK FRIDAY SALE
Save up to 25% off ALL T-shirts from the NeatoShop! Hurry - sale ends Nov 29, 2015.