Here's the design that I came up with (there is a printable version for you at the end of the post):
You can have them laminated, or you can carefully coat both sides with clear packing tape, then trim off the excess. (Try it on a test piece first if it is your first time doing this!)
If your kids can draw their own outlines for their superheroes, I think these will turn out even better! I am hoping we can try that next.
Click on the picture below to get a printable version:
** added 5/6/12** click here for some other fun ideas for your superhero paperdolls!