Make cake. Prepare batter following recipe directions. Bake and cool two 6 in. cake layers. Prepare buttercream icing following recipe directions. Tint icing a very pale teal color. Level, fill and stack cake on cake circle, for 2-layer cakes, 5 in. high. Use spatula and icing to ice cake. Swirl top of cake by starting at outer edge and swirl around moving toward center.
For sides of cake, start at bottom of cake to create grooved effect around cake. Repeat, moving spatula up approximately 3/4 in. for additional rows.
Reserve remaining icing.