Make layered cake. Prepare batter following recipe directions. Bake and cool 2-layer cake. Prepare buttercream icing following recipe directions. Tint rose. Layer and fill on foil-wrapped cake circle, trimming cakes and adjusting icing fill as needed for a 4 in. high cake. Place on foil-wrapped cake circle.
Ice cake. Use spatula and rose icing to ice cake smooth. Chill cake for 30 minutes.
Add drizzle design. Place cake on turntable. Melt light cocoa Candy Melts candy according to package directions. Use melted light cocoa candy in cut decorating bag to drizzle design randomly onto cake. Chill until firm, about 5 to 10 minutes.