STIR boiling water into gelatin in large bowl at least 2 minutes until completely dissolved. Add enough ice to cold water to measure 1-1/2 cups. Add to gelatin; stir until ice is completely melted. Refrigerate about 45 minutes or until gelatin is slightly thickened.
REMOVE 1-1/2 cups of the gelatin; set aside. Add 3/4 cup of the whipped topping to remaining gelatin; stir with wire whisk until well blended. Pour into 8-inch square dish. Refrigerate about 15 minutes until set but not firm. Carefully spoon reserved gelatin over creamy layer in dish.
REFRIGERATE 3 hours or until firm. Cut into 9 squares to serve. Top each serving with a dollop of the remaining whipped topping.