Dancing raisins activities. Lots of fun experiments. I have done this experiment, and seen the entire class become silent out of curiosity. It is a great engagement piece for a lesson, and it can be hands on if you ask for volunteers!
Toddlers will love the idea of shape hopping, care giver would call out the shape and color and the child's job is to find the shape and matching color. Great for large motor development and body and eye coordinations.