About 4 years ago I found the directions to make a skeleton out of milk jugs here and decided to try it. I have to say that it turned out surprisingly well and was pretty interesting to look at, and I highly recommend trying it. Just make sure that you rinse out the milk jugs really well, use a sharp exactoknife, and a good glue gun.
In fact so many of you have been by investigating that link that I think I'll make one and post a picture! We just have to drink up lots of milk so I can save the jugs now.