I have made pizza on a flour tortilla. I bake it a couple of minutes first to crisp it up. My current favorite low cal pizza is to take a portabella mushroom and break off the stem and scrape out the gills with a spoon. Then either bake or grill it until done. Grilling is my favorite. I take a can of tomatoes with garlic olive oil and basil and cook it down until pretty dry. Put it on the mushroom crust, top with a little cheese, chopped turkey pepperoni or whatever pizza topping you like. Pop in the oven or grill to melt cheese. YUM!