Make up the cake mix according to manufacturer's instructions. Measure out 4.5 pounds batter, deposit 1 pound 8oz into a sprayed and papered 8-inch cake pan. Repeat again two times to make 3 cakes total. Bake at 350F until cake springs back lightly when touched. Let cool completely. Mix Vanilla VelveTop with Chefmaster Blue Sky Liqua-Gel Color and reserve. Once cooled, trim the bellies of each cake, saving them for other uses. Place one cake round on a cake board, and fill with blue vanilla VelveTop. Place the other round on top and crumb coat with blue vanilla VelveTop, top with another cake round. Insert internal dowels or supports into the cake. Smooth ice with blue vanilla VelveTop and dust the bottom of the sides with sprinkles. Decorate the top with vanilla VelveTop rosettes.