Once you have a basic tomato sauce in hand, you could do zillions of variations. Add grilled veggies, or slivers of ham, or even some fish or prawns. Just do me a favor please and do not add chicken. All the rest is fine with me.
It should be cooked fast and at a high heat so that the tomatoes retain their summer sweetness, yet long enough to lose the watery quality that signals a bad sauce.