I took two silicone cupcake holders and made cupcake shaped ice cubes. It was one of my favorite parts of the tub and now I’m looking for other things around the house that would be neat to put water in and freeze. I also included ice cubes shaped liked hearts.
After everything was frozen, I put all the ice cubes into the tub with some sponges, cups, funnels, a spatula with points, straws, eye droppers, a turkey baster, a shovel, a paint brush and q-tips to explore the ice with. They can find treasures within the ice cubes, look at mixing colors, experience the ice melting and play with the water.