Spray the shaving foam into the tray and spread it with the palette knife to an even layer of about 1 inch (2.5 cm) thick (photo 2). Drop some paint on the surface of the foam (photo 3) and swirl the colors around with the stick (photo 4).
Place a sheet of cardstock on top of the shaving foam and press on it to make sure the sheet is touching the foam. Gently peel the cardstock off the foam and lay it on a flat, hard surface (photo 5). Remove the shaving foam from the cardstock with the palette knife (or credit card) and a paper towel. Let the cardstock dry (photo 6).
Place another sheet of cardstock on the shaving foam and repeat the steps.