Save (click on the small image and then right-click to save) and print out one of the templates below on cardstock paper and decorate. I found that it's best to then glue the paper to another sheet of cardstock paper to make them stronger and less flimsy.
After you're finished decorating all of the pieces, you cut them out and glue the handles to the sides. It's best to use a stronger glue like crazy glue or a hot glue gun, but regular Elmer's glue should work okay, too. I used an X-Acto knife to cut out the eye holes. These were really popular with the kids at my work. :)
Another optional variation of this craft I've tried was taking some colored transparent saran wrap or plastic wrap and gluing it to the inside of the eye-holes to make them look more like sunglasses.
*Note: I did not create these templates