Macaroni and cheese pizza is a wonderful thing that you are deprived if you don't try it once. Well any macaroni on pizza is really good, like my Moms homemade ziti pizza

Another great pizza is this kind that one local shop has. It's a thinner crust, and the sauce is a combo of Red and White sauces. The White sauce takes the effect place of the cheese, and topped with a few leaves of Basil. So good!

Also toppings are always best under the cheese, not over it. All the flavor baked right into the pie.

As for odd toppings I'll go through my pizza experiments when I got bored.
Cereals - Crunchy but not very good.
BBQ sauce - Only a little bit of sauce, overpowers the pizza very easially
Ice Cream - Delicious
Brownies - No. Brownies are too rich for a pizza topping. Best to save them to mix in Ice cream
Ranch Dressing - See BBQ sauce
Tea leaves - it actually kinda worked. I opened a bag and sprinkled the tea onto the pizza. Use good tea when doing this.
Maple Syrup - best keep the syrup on the waffles.
Waffles - I was really bored that day. it was meh
French Fries - They just kinda sat there not doing much.
Mashed Potatoes - It was like putting a cloud on the Pizza. a salty cloud because the potatoes were salted beyond reason for some reason.

I did other odd things as well, but I forgot what they were :/