Birthday cake image. Bake your favorite birthday cake, with all the frosting and decoration. As a final touch, add a personalized message on the birthday cake. As a final touch, add a personalized message on the birthday cake. Not the usual, "Happy Birthday," but something special. Use the frosting to write out a personalized message. A message that communicates happiness, humor, and of course, celebration. Here are some birthday cake quotes that are short and crisp. Convey the thought in a few words.