Wal-Mart carries bags of mini sizes bagels - you could perhaps make mini pizzas with all sorts of different toppings using those. It would take a little work putting toppings on them all, but after that, all you would have to do is just throw them in the oven for a bit. Or just get some long french breads and make a variety of french bread pizzas, that can be cut into strips.
There are recipes for a baked pizza dip, that basically calls for a cream cheese layer, a layer of sauce, then a layer of shredded cheese, then toppings on the top - bake the whole thing until melted and golden. You could serve it with garlic bagel chips, which are sturdy and will hold up to the heavy dip.
Pizza croissant roll ups would also be fun, plus you can buy some string cheese to go in them that will make them even easier to assemble.
