Place Batter Dividing Ring in the first pan; spray both with vegetable pan spray. Prepare cake batter; divide into thirds and tint each portion yellow, rose and violet, stirring gently. Fill each section half full as follows: violet colored batter in center, yellow colored batter in middle section, rose colored batter in outside section. Gently tap pan on counter; remove ring and wash well. Repeat in second pan, filling center with yellow, middle section with rose and outside section with violet colored batters. Repeat in third pan, filling center with rose, middle section with violet and outside section with yellow colored batters. Bake 30-35 minutes or until toothpick inserted in center comes out clean. Cool in pan 10 minutes. Remove from pan and cool completely.
Level cake layers; stack layers on serving plate, spreading buttercream icing between layers. Spatula ice cake with buttercream. Pipe tip 6 bead top and bottom borders.