1Heat oven to 350°F (325°F for dark or nonstick pans). Make, bake and cool cake as directed on box for two 8-inch or 9-inch round cake pans.
2In medium bowl, tint 1 container frosting with neon purple food color. Using 1 cake round, cut in half to form 2 semicircles. Put halves together with 1/4 cup frosting to form body. Place upright on serving plate, cut side down.
3Frost cake with frosting. Cut ears from construction paper; wrap ends that will be inserted into cake with plastic food wrap. Insert into cake. Using toothpicks to attach, use 2 small marshmallow halves and 2 small jelly bean halves for eyes. Use large jelly bean for nose and sour candy strips for whiskers. Place gum halves just below nose for teeth. Use large marshmallow for tail.
4Repeat with remaining cake to make second bunny, using neon pink food color. Frost and decorate as above. Remove ears, plastic wrap and toothpicks before serving. Store loosely covered.