Pour 1 cup batter into greased and floured 2-cup ovenproof glass bowl.
Pour remaining batter into greased and floured foil-lined 13x9-inch baking dish.
Bake both cakes 25 to 30 min. or until toothpick inserted in centers comes out clean. Cool cakes 10 min.
Remove from bowl and pan to wire racks; cool completely.
Reserve 1/2 cup COOL WHIP for later use. Stir 5 drops food coloring into remaining COOL WHIP.
Transfer 13x9-inch cake to platter; frost with green-tinted COOL WHIP.
Invert round cake and place on top of 13x9-inch cake; spread with reserved COOL WHIP. Decorate with black decorating gel as shown in photo to resemble soccer ball. Tint coconut with remaining food coloring; sprinkle over cake.