Ice 2-layer cakes smooth with buttercream icing. Tint fondant blue and roll 1/8 in. thick. Use largest oval cutter to cut 93 oval medallions. Attach medallions to cake sides approximately 1/8 in. apart. Attach medallions to tops of cake in a circle 3/4 in. from edge of 8 in. cake, 1 1/4 in. from edge of 10 in. cake and 1 3/4 from edge of 12 in. cake. Use tip 2 and royal icing to pipe 5-petal flowers in centers of medallions and balls around edges.