HEAT oven to 350°F. Coat 2 (9-inch) round baking pans with baking spray with flour. Prepare cake mix according to package directions using water, oil and eggs. Spread evenly in prepared pans. Bake 29 to 33 minutes or until toothpick inserted in center comes out clean. Cool 10 minutes. Remove to wire rack to cool completely.
PLACE 1 cake layer on serving plate, rounded side down. Spread with 1/3 cup white frosting. Top with remaining cake layer, rounded side up. Frost top and sides of cake with remaining white frosting.
CUT cake cones vertically in half using a serrated knife. Press cut side of 12 cone halves onto sides of cake, spacing evenly, with top edges of cones touching. Place purple frosting in decorating bag fitted with medium star tip. Pipe frosting onto each cone half to resemble ice cream cones. Pipe decorative star border around bottom edge of cake. Sprinkle top of cake and cones with candy bits from the purple frosting.