2 pkg. (4-serving size each) JELL-O Brand Berry Blue Flavor Gelatin
2 pkg. (4-serving size each) JELL-O Brand Gelatin, any red flavor
3 cups boiling water, divided
2 cups cold water, divided
1 cup thawed COOL WHIP Whipped Topping
PLACE each flavor of dry gelatin in separate medium bowl. Add 1-1/2 cups of the boiling water to gelatin in each bowl; stir at least 2 minutes until gelatin is completely dissolved. Stir 1 cup of the cold water into gelatin in each bowl.
SPRAY Uncle Sam's Mold with cooking spray; place on baking sheet. Pour blue gelatin into the side of the prepared mold with the stars; pour red gelatin into remaining side with the stripes.
REFRIGERATE 6 hours or overnight until firm. Unmold. Decorate with whipped topping as desired.