Buddhist Tibetan monks have a tradition of creating beautiful sand mandalas. The monks create the designs in silence and while meditating. When they are finished, the mandala is swept up and sent down a river of water to honor the value of impermanence. I love discussing this art form with my students. It's difficult to imagine destroying something so beautiful, but we talk about how the important factor is the process, not the product!
4th graders created radial symmetrical, geometric mandala designs on styrofoam and printed them with gradient colors.