For this activity today, I
1) outlined the kids' bodies on freezer paper. (I use freezer paper because it's cheaper and wider than art paper, and lined so it doesn't seep through.)
2) Then they filled in the outline with paint. In theory it was supposed to look like them, but, well, you can see how that turned out.
3) Later on as a reading exercise, they read the names of body parts I'd printed on index cards, gluing them in the right place.