All that's needed to create these confections is some vanilla cake batter that you can purchase from your local grocery store, or make from scratch if you please. Then you simply split the batter up into little bowls, as many as you want, and then add food coloring. Once the color has set you pop the mixture into a plastic bag and cut the ends off, and start layering your jars with each color of the batter. You then place the jars in the oven until the batter is thoroughly baked. Once they have cooled off, you cut the top off the cakes and add some of your favorite icing and sprinkles.
This easy project by the 'Running With Glitter' Blog is great for any occasion, but would especially make for a killer birthday treat.