On serving plate, place cake layer with rounded side down. Frost top and side with white frosting. Frost 7 cupcakes with blue frosting, 4 cupcakes with pink frosting and 1 cupcake with yellow frosting. Place 1 blue cupcake on center of white frosted cake. Place remaining blue cupcakes, sides touching, in circle around center cupcake. Place 2 rows of 2 pink cupcakes on top center of blue cupcakes. Place yellow cupcake on top center. Sprinkle with candy sprinkles. Store loosely covered.