Any cake, any frosting. (Based on personal experience, 'Pound' cake is the best for cut-up cakes. It is firmer and cuts easier). Using pattern, cut out the pieces on your cake and assemble as shown in the second photo. Dye coconut to colors to match your baby shower theme
( http://www.cakeworkscentral.com/tips-hints/coconut.htm )
and add jelly beans or mini candies to form the ribs of the umbrella. Crush a candy bar, use brown sugar or dye coconut brown to decorate umbrella handle. We prefer and use Baker's Coconut, not because this cake is compliments of their web site, but because we've found it to be the best after years and years of making cut-up cakes!