To adorn your heart with roses, roll out at least a dozen balls of Model Magic compound, varying from very small to medium size. With your thumb or finger, press the smallest ball flat so that the petal sides lip up slightly. Cut in half. Take one half and curl the tips together, keeping the lips on the outer edge. With the other half of the ball, wrap it around the side where the first tips touch. This is the center of your rose that you will build petals around.