Some people like to make an angel food cake as a birthday cake.
I have made this one before, and it was great. I made a butter icing, and just tinted the color I wanted. I put in those little dragees you see in the store inside the batter. Always save 1 cup of starter for your next cakes, then start with day 2 of the starter instructions instead of having to start a new starter each time. A nice sugar-free apple cake sweetened with fruit juice.