Sandpainting was an art form in which sand of different colors was used to create intricate patterns on a flat surface. This art form was practiced by Native Americans, Tibetan monks, and Australian Aborigines.
When Chakotay and Kathryn Janeway were stranded on the so-called New Earth planet in 2372, Chakotay worked on a colorful sandpainting while the captain was relaxing in a bathtub. (VOY: "Resolutions")