I've made a flag cake for the Fourth of July and other patriotic holidays, but this year I made cupcakes in the shape of a flag. The cupcake container holds 18 cupcakes, which I didn't think about when I was transporting them without their decorations. I probably should have packed 20 to make a nice rectangular shape.
The cupcakes were yellow cake - basic recipe that I got from a stack of recipes my dad picked up at a garage sale - and the frosting is whipped cream. The frosting of a flag cake is traditionally Cool Whip, but the real stuff is more delicious.