There's a thing going round work atm (some of us get a little spare time every now and then OK? ) and I'm having quite some fun with it. It's called Cube Craft. Basically you get prints off a website, you print them out on your standard color laser and cut them out and fold them up. There are images of all your favorite nerdy characters from Star Wars to Family Guy, and they're all in a cube (or more accurately, rectangular prism) shape.
The website I'm into is cubeecraft.com. Here are a few samples, click on them to download their pattern:
Let us know which ones you make, and give us some photos if you can. I'll post back once I've completed my Vader