This is actually an idea from my friend Emily from her days working at a child care center. If you find you have some Rice Krispies that have gone stale, throw them in your sensory table. Throw in a few cars (I would recommend more like a monster truck or something with bigger wheels, higher off the ground). Makes a fun crunching noise when they drive over it. You can see Ella's hands here, she just liked playing with the cereal, and of course since it is a small cereal, I wasn't afraid of Olivia playing with it and choking on anything.