Unicorn-themed cakes are all the rage among kids. This cake is usually made with layers of colorful cake, flavored with vanilla or funfetti. The frosting is often a pastel-colored buttercream, and the cake is decorated with edible unicorn horns, ears, and flowers. The final touch is a dusting of edible glitter to give it a magical sparkle. This cake will make any birthday girl feel like she's in a fairytale and add a touch of whimsy to the celebration.