Some toddler activities for inspiration! 50 sensory activities, arts and crafts, material explorations and other toddler activities!
2T cornstarch + 2T water + 5 drops food coloring = Sidewalk Chalk Paint.
Make Watercolor Paints - baking soda, vinegar, light corn syrup, corn starch, and food coloring. It will be ready to use in a couple of days. (Must dry first.) Like the idea of using a muffin tin, could get one from the dollar store just for this.