2 pkg. (2-layer size each) white cake mix es, divided
3 Tbsp. (1/2 of 3-oz. pkg.) each JELL-O Raspberry Flavor Gelatin, Orange Flavor Gelatin, Lime Flavor Gelatin and Berry Blue Flavor Gelatin, divided
2/3 cup BREAKSTONE'S or KNUDSEN Sour Cream
1 tub (8 oz.) COOL WHIP Whipped Topping, thawed