Bake and cool cakes. For tree, trim off bottom section, leaving top 3 sections for hat. Trim off 1/2 in. from tree branch tips on each side to form triangle. Ice tree to level and smooth in buttercream. For soccer ball, trim 2 in. off one end. Ice flat ends of cakes and position end-to-end on foil-wrapped, double thick board, cut to fit. Ice ball cake smooth for head. Pipe tip 5 oval eyes and string mouth. Pipe tip 2A pull-out nose and dot cheeks (pat eyes, cheeks and nose smooth using finger dipped in cornstarch). Cover hat with 1 in. wide stripes of violet and white tip 16 stars. Pipe tip 1M swirl brim and pompom.