I wish I knew the original source of this. It's been on my HDD since 2008, probably downloaded from 4chan. I love paper models and this one is appropriate for all ages, the instructions are in German, but I think most of you should be able to suss it out on your own.
This can be made with standard weight paper, but if you have access to 110 weight card stock you will see much better results. Score edges with a butter knife, cut to the outer lines, fold and glue with thin layers of Elmer's style white glue or specialty paper glue if you have it.