You’ll need a bowl of water, white and various acrylic paint colors, a big brush, and a thin brush to create a marble painting.  To start, prepare a wash by combining some white paint with a tiny amount of water. Overlay this on the entire canvas. This will produce the painting’s background.  Choose the colors you’ll use for your marbles next. Each color should be blended separately with water in a small bowl until it is thin enough to paint with. Apply the colors to the canvas in circular motions using the large brush. Make sure each color on the palette is next to or above its appropriate color. Let the colors be.