Prep Time: 15 minutes
Servings: 12
Slice 1 cup strawberries; halve remaining strawberries.
Cover bottom of 13x9-inch dish with cake slices; top with sliced strawberries and 1 cup blueberries. Spread COOL WHIP over berries.
Arrange strawberry halves and remaining blueberries on COOL WHIP to resemble a US flag. Keep refrigerated.