I like to slice up tomatoes and onions really thinly, coat them in olive oil with a healthy dollop of pesto and oregano mixed in, then lay all of that on the tomato base, and put on loads of capers and olives and anchovies. If that's all on a proper thin and crispy base, I'd not even bother with any cheese.
Obviously, you could leave out the anchovies if you're going veggie on it. In which case some mozzarella would be a good addition. If you can get vegetarian mozzarella, which I don't know.
For me, a meaty pizza has to have salami and pepperoni on it. Not too fussed about ham or chicken or mince or any other sort of meat.
(Har! I wrote "mice" for mince first
)