We have that too. At some pizza places they're called "speciality pizzas." But almost every pizza restaurant also lets you make your own by choosing ingredients individually; they're priced by number of toppings, with one sauce and cheese being included in the base price.

My wife actually discovered that this is pretty much just a North American thing a while back, incidentally. She lived with some Europeans and a Japanese person for a little while during college, and they were all shocked at the North American pizza ordering process.