Found from Betty Crocker just a week ago. I'm posting this because I'm definitely making this for our 4th of July celebration this year. The recipe is pretty neat using fresh fruits in the cake mix and ending with a layered cake that when cut looks like an American Flag. Feel free to use homemade frosting, etc. as I'm just posting as written on their site.
****Note made on July 4, 2012 and here are some hints: The whipped frosting is great inside but you really need a heavier frosting for the outside coating. I could not find red/white/blue sprinkles so I topped the cake with M&Ms in those colors (lucky to find those) or I'd just use a nice design of colored coarse sugars in red and blue in a circular pattern. The blue & red cakes are still really off in color and not perfectly blue even with the gels so just be prepared for more of a light blue and light red in color instead of deep colors. Other changes I've made to the actual recipe.