Start by preparing the fruit. Wash the strawberries, blueberries, and raspberries under cold water. Hull and halve the strawberries, and slice the bananas into rounds.
On a large serving platter, arrange the strawberries in a row to form the stripes of the flag. Use about 1 ½ cups of strawberries for this.
Next, create the blue section of the flag by placing the blueberries in the top left corner of the platter. Fill this area with about 1 cup of blueberries.
Fill in the remaining space with the banana slices, arranging them in a way that complements the overall look of the flag.
If desired, serve with whipped cream on the side for dipping.