Make Your Own Sidewalk Chalk
You need: 1 cup Plaster of Paris, 1 cup water, some powdered tempera paint and molds like small paper cups or toilet paper rolls. To do: Mix Plaster of Paris and water, and add tempera powder little by little until you get the color you want. Pour into molds, and let dry. When completely dry, peel away the cup/mold, and get kids drawing!