Pour the blue batter into each of your cake pans in a swirly pattern. Use a butter knife to slowly stir until the blue batter is spread throughout.
Bake according to directions on box. Allow cake to fully cool before frosting.
Add your decorations!
Note: Nutrition information is a rough estimate only; actual values will vary based on the exact ingredients used and amount of recipe prepared. Nutrition info is for cake mix and frosting. Decorations are additional.