1. Use a craft knife and a metal ruler to cut a star-shaped stencil out of a large piece of chipboard or cardboard.
2. Mist the patch of grass with a spray bottle of water.
3. Place the stencil on the grass and, using a sifter or large strainer, sprinkle a very small amount of white flour into the stencil.
4. Carefully remove the stencil and dispose of the excess flour. For a longer-lasting star that can be walked on, use spray or marking chalk. To find suppliers, search the Web using the key words "spray chalk."