Mosaic patterns : Amosaicis a piece ofartor image made from the assemblage of small pieces of coloredglass, stone, or other materials. It is often used indecorative artor asinterior decoration. Most mosaics are made of small, flat, roughlysquare, pieces of stone or glass of different colors, known astesserae. Some, especially floor mosaics, are made of small rounded pieces of stone, and called "pebble mosaics". Others are made of other materials.