Jalapeno, Pineapple, and Olive. Sounds weird, but it's a nice mix of spicy, salty, and sweet.
If I'm making my own pizza, I get the awesome four cheese blend from Trader Joe's and do tomatoe (Roma/Plum), tons of garlic, red onion, green bell pepper, and avocado. It's awesome and by far my favorite pizza.
Broccoli, spinach, and arugula can also be good on pizza sometimes.