Boil the Pasta: Bring a large pot of salted water to a rolling boil. Add the short pasta and cook according to the package instructions, usually around 8-10 minutes, until al dente.

Prepare the Coloring: In two ziplock bags, add three drops of red food coloring and one tablespoon of water in one, and blue food coloring in the other.

Color the Pasta: Divide the cooled pasta into three portions, putting two into the color bags. Seal and shake to coat, soaking for about 5 minutes.

Rinse the Colored Pasta: Carefully rinse the colored pasta under cold water to remove excess dye. Drain well and set aside.

Combine the Ingredients: In a mixing bowl, combine the mini pepperoni, cubed mozzarella, diced red onion, and chopped red bell pepper. Add the Italian dressing and mix thoroughly.

Mix in the Pasta: Gently fold the plain, red, and blue pasta into the bowl with the other ingredients until evenly distributed.

Chill Before Serving: Cover the bowl with plastic wrap or transfer to an airtight container. Chill for at least one hour before serving.