Tint icing and prepare decorating bag. Combine Lemon Yellow and Golden Yellow for yellow shown. Combine Kelly Green with a touch of Royal Blue for green shown. Combine Violet and Royal Blue for violet shown. Divide icing and tint 1/4 cup yellow, ¼ cup green, ¼ cup rose, ½ cup violet. Place ¼ cup violet icing in decorating bag with tip 2C. Reserve white icing.