Bake cakes as follows: 8 in. square (two, 2 in. layers and one, 1 in. layer); 10 in. square (two, 2 in. layers); 12 in. square (two, 1 1/2 in. layers); 8 x3 in. round (one layer). Let cool. Ice cakes smooth with buttercream. To achieve shade for 12 in. square cake, mix equal parts of Violet and Royal Blue Icing Colors.