Paint a rock to look like an animal, scene, flower etc. Work with the natural shape of your rock to make it even better! Is there a part that looks like a chin, ears, a bunny tail? Helpful hints: clean your rock well first. You can use nail polish, tempera paint, or acrylic paint. If you want to do this activity with a group of kids and have better, brighter results with washable paint, then prepare the rocks beforehand by painting them all white with any thick paint such as art acrylic or household latex paint.