Also on these boards
The Foamerator, the most awesome homemade toy ever! Cut the bottom off a water bottle and cover it up with a damp piece of old terry cloth & secure with a rubber band. Then dip into bubble soap and blow into the mouthpiece--watch HUGE bubble snakes emerge! Easy video tutorial.
Homemade bath crayons. Here's just 1 of the hundreds of great ideas on this family website "A Magical Childhood". Freaking genius.