Unless the natural color of your stone will be part of your design, start by painting your stone with an undercoat, such as white, black or dim. When applying an undercoat or painting a rock on more than one side, paint one side and afterward turn it over and stand it on top of a container and paint the top. When dry you can turn it over and do any necessary cleaning up. Use good quality brushes which are made for fine detail. The designs you choose can be anything including, people and peasant symbols, nation, and small scale landscapes. You could design the zodiac signs; create Halloween creatures and Christmas characters. Basically you can design anything you need. You can take a gander at your stone or rock and what shape, if any, it evokes. Apply the design with a fine felt pen or pencil. You can stretch masking tape across the stones to make exciting stripes or angles. Spray paint, sponges and stencils are also great tools to use. When you have finished your project it is important to give your stone a layer of varnish. This just makes it look finished and furthermore protects it. You can use polyurethane and clear lacquers. Two slim coats of varnish are better than one thick coat. When dry apply a small bit of felt underneath to prevent them from scratching table tops.