Make your own Thing costume
Over at the Make site they have the coolest shot of someone who has made their own Thing costume with real rocks. Yes that's Thing from the Fantastic Four comics and movie. It looks spectacular but weighs a mammoth 100lbs!
The guy who made the full costume took photographs of each stage, and you can see and learn about the whole process over at his site.
How cool is that, and how much time has this guy got on his hands? At least wearing the suit will make you fit!!