SLICE 1 cup strawberries; cut remaining strawberries in half.
ADD boiling water to gelatin mix in large bowl; stir 2 min. until completely dissolved. Add enough ice cubes to cold water to measure 2 cups. Add to gelatin; stir until ice is melted. Refrigerate 5 min. or until slightly thickened. Meanwhile, cover bottom of 13x9-inch dish with cake slices. Add sliced strawberries and 1 cup blueberries to thickened gelatin; stir gently. Spoon over cake.
REFRIGERATE 4 hours or until firm. Cover with COOL WHIP. Arrange strawberry halves on COOL WHIP for stripes of flag and remaining blueberries for stars.
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