MIGHT USE THIS IDEA - Very Hungry Caterpillar Mobile. Hang lanterns red, 6 in two shades of green) with different lengths of fishing line. Use pipe cleaners for antennae, and construction paper for eyes and nose. Very cool in a children's library space.
Balloon Powered LEGO Car If you have the pieces for these (I think we have a couple wheels already), I have balloons. I can print out the directions and have it as a building project activity for the biggers?