sand painting

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A design made by trickling fine colored sand or other powders onto a flat surface, created for ritual purposes especially by Tibetan Buddhists and by the Pueblo and Navajo peoples.
• noun The art of making designs with colored sand.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a painting done by Amerindians (especially Navaho); made of fine colored sands on a neutral background