Making Marbelized Objects
To create marbleized designs, you'll need some specific supplies. They are inexpensive and readily available at art-supply and crafts stores.
For a "stone" pattern, speckle paint on solution. Move the paint in spirals using a knitting needle or skewer for a swirled design.
To make arches, draw the rake through the paint, first along the width of the tray, then across the length.
To make a rake, sandwich toothpicks taped at 1/4- to 1-inch intervals between layers of corrugated cardboard.