1. Rolling out clay to 1/4-inch thickness. Place leaf, vein side down, on surface of clay. Use roller to roll over the leaf (and thinning the clay). 2. Lift clay off mat, with leaf still in place, and trim excess clay with scissors. 3. Make oval shaped ring from a piece of aluminum foil and arrange leaf covered clay inside, making sure the bottom of the clay is resting on a flat surface.