Boil a large pot of salted water over high heat, add the whole wheat penne pasta, and cook according to package instructions, usually around 8-10 minutes. Drain and rinse under cold water.

Wash and slice your cucumber into rounds about half an inch thick. Carve out jack-o-lantern faces into the cucumber slices.

In a Ziploc bag, mix 1/4 cup of water with the natural purple food coloring. Add the cooled pasta, seal, and toss to coat. Let it sit for about 5-10 minutes, then drain and rinse again.

In a large mixing bowl, combine the colored pasta, jack-o-lantern cucumber slices, chopped broccoli, halved cherry tomatoes, shredded carrots, and shredded cheese. Drizzle with Italian salad dressing and toss together.

Cover with plastic wrap and refrigerate for at least 1-2 hours, or overnight for better flavor infusion. Toss again before serving.