Slice a pound cake in 8 thin slices and lay them in a 9x13 glass baking dish; cover with 1 cup blueberries, 1 cup sliced strawberries; cover with 8 ounces Cool Whip; place 50 blueberries in upper left-hand corner for stars; use sliced strawberries laid lengthwise to make 5 red stripes. Refrigerate for 30 minutes before serving.