Preheat oven to 350°F. Spray pan with vegetable pan spray. Prepare cake mix according to package directions, but divide batter into thirds. Set aside 1/3 of the batter. Stir 2 tablespoons cocoa powder from cake mix into 1/3 of the batter; stir strawberry flavoring powder into remaining 1/3 batter. Scoop yellow, cocoa and strawberry flavored batter randomly into pan.
Bake 30-35 minutes or until toothpick inserted in center comes out clean. Cool cake in pan 10 minutes. Remove cake from pan onto cooling grid; cool completely. Arrange on fanci-foil covered cake board cut to fit.
Roll out cookie dough 1/4-inch thick; cut triangle shape for party hat. Bake 7-10 minutes; cool completely. Spatula ice cooled cookie with violet buttercream icing.
Spatula ice feet and paws with white icing. Outline and pipe-in inside of ears and whites of eyes using tip 3; smooth with finger dipped in cornstarch. Add tip 12 white buttercream tummy and muzzle, smoothing with finger dipped in cornstarch. Cover bear's body, head and arms with tip 233 yellow pull-out fur. Outline mouth, nose and pupils with black tube icing, smoothing as necessary with finger dipped in cornstarch. Add confetti sprinkles. Insert lollipop stick into top of head to support hat. Insert hat cookie in top of head, resting on lollipop stick. Pipe tip 3 number onto hat. Add tip 18 white icing pipe pull-out star hat pompom and fringe. Position party horn on cake.