Decorate cake. Place cake on turntable. Spatula ice cake smooth using magenta icing. To form ribbons, place tip of spatula on bottom side of cake. Carefully move tip of spatula up as cake spins on turntable. Continue until sides of cake are complete.
For top of cake, place tip at edge of cake and move spatula towards center as cake spins on turntable.
Garnish bottom of cake with berries and mint leaves.