Make you own favorite cake, in a large sheet pan.
Outline the flag on the top of the cake with a toothpick.
Fill the upper left corner with blueberries.
Place 2 rows of raspberries across the top of the cake like a red stripe.
Put the icing in a pastry bag fitted with a star tip and pipe two rows of white stripes below the raspberries.
Alternate rows of raspberries and icing until the flag is completed.
Pipe stars on top of the blueberries.