Kid's artwork is just awesome. When I taught elementary overseas my favorite exercise was to fold a sheet of paper three ways, have one kid draw the head of a monster, another draw the body and a third draw the legs or tail.
We got some awesome results and I used the drawing to teach describing words (hairy, tall, fat).
There are a couple of great projects online teaming kids with grown artists.
The Monster Engine (
LINK) comes to mind.
The Guardian recently ran a 'make a monster' contest as well. The results were awesome! (
LINK)