Preheat the oven to 350 degrees, and spray a 9x13 baking pan with cooking spray.
Prepare the cake mix according to directions on the package.
Divide the cake batter between 4 small bowls, and add 2 drops of different food coloring to each bowl. You will have 1 bowl of each color. Stir so color is completely mixed.
Use a spoon to add the batter to the pan. Place the batter in rows of alternating colors. I did 5 rows, but you could do more or less.
Bake in the oven according to package directions (I did 25 minutes), or until a toothpick inserted into the center of the cake comes out clean.
Remove from the oven. Use the end of a wooden spoon to poke holes all over the cake, about 1 inch apart.
Prepare one box of pudding with 2 cups of milk in a medium bowl, whisking for 2 minutes. Pour the pudding over the cake, and spread it into the holes, and over the cake.
Refrigerate cake for 1 hour.
After 1 hour, mix the second box of pudding with the remaining 2 cups of milk, whisking for 2 minutes. Fold in the whipped topping, and spread it over the cake.
Top the cake with half of the sprinkles.
Refrigerate for 2 more hours.
Add the rest of the sprinkles right before cutting.
Video
Notes
Experiment with the food coloring in this recipe to make new colors. This cake should be bright, fun, and unique!
Use a silicone spatula to apply the whipped topping and pudding frosting. Apply with smooth, gentle strokes.
This nutritional information is approximate and was calculated using online calculators. Your nutritional information may vary depending on numerous factors.