Ingredients Tools Straight Stainless Steel Spatula, 9-Inch Straight Stainless Steel Spatula, 9-Inch 12-Inch Disposable Decorating Bags, 24-Count - 12-Inch Disposable Piping Bags 12-Inch Disposable Decorating Bags, 24-Count - 12-Inch Disposable Piping Bags Standard Coupler Standard Coupler Decorating Tips Instructions Click to mark complete - Prepare two to four colors of icing. Using a Straight Spatula, add dollops of icing to the decorating bag, alternating colors randomly. - Clean the spatula before switching to a new color. Be careful not to mix the colors too much in the bag, because this will cause the colors to blend instead of marble.