WILTON-Fondant Shaping Foam. Thick and thin squares are the ideal soft surface for shaping flowers, leaves and other fondant or gum paste cutouts. Use the thin squares for thinning petal edges with a ball tool, carving vein lines on leaves and making ruffled fondant strips. Use the thick square for cupping flower centers. Thin 4x4x1/8in and thick 4x4x1in.