Ordinary river rocks and water tumbled stones make wonderful art material. Not only are rocks cheap or free in many parts of the world, but painting on something that already has a shape and dimension is like discovering a short-cut to exciting results. Lin Wellford literally wrote the book on turning rocks into art, but rocks have been used as a painting surface since cavemen first began decorating the walls of their caves. Rocks and pebbles have frequently been used to make craft projects, but they can be used for so much more. Field stones and chunky roadside rocks can be painted to look like flowers and plants, or like little cottages.Pebbles can be butterflies or tropical fish. The more you paint, the more you will see all the possibilites.