Now, the Candy Corn Pizza shown below, I would recommend for a kid's party. The kids will get one giant "candy corn" slice each. It's actually a real pizza crust made with Alfredo sauce or ricotta (for the white) and cheddar cheese (for the yellow). You can brush the edges of the crust with a light tomato sauce to make the edges more red-orange if you'd like. In essence, this does qualify as a genuine pizza. The others? Not so much.
My pizza crust recipe (use half to make smaller pizzas)
1/2 jar of white sauce (Alfredo or garlic parmesan, etc.) or ricotta cheese
1 1/2 cups shredded cheddar cheese
3/4 cup shredded mozzarella cheese
1/2 cup tomato sauce