Paper Mache eggs - I put a little toy dinosaur in a balloon, blew it up and covered it in paper mache and let it dry overnight. The kids really liked decorating them and they loved breaking into them and getting the dinosaur out.
Volcano cake - This cake was super easy. My sister in law Sarah gave me the idea. you mix a cake mix as directed and pour into a bowl. pour a can of frosting in the middle and put it in the microwave for 8 min. Turn onto a plate and the lava pours out. Next time I will do red frosting. (they didn't think it looked very much like lava)
Salt dough eggs - I wrapped little toy dinosaurs in salt dough and shaped them like eggs and let them dry. They took almost 3 days to dry but the kids also thought these were pretty cool.