In a microwave safe bowl take 2 cups of mini marshmallows and 1 tbsp. butter, heat them until smooth. Take the bowl out and add 4-5 drops of blue food coloring. Mix until you get an even shade of blue throughout the mixture. Add 2 cups of rice krispies to the bowl and mix well. Repeat the above procedure twice, once using red food coloring and once without any food color. Once all 3 mixtures are ready, in a baking dish layer them one by one with the colorless layer in the middle. Refrigerate for at least one hour until all layers harden up. Once hardened, cut in equal parts and serve.