I've never made one (yet), but I've got the sausage in the fridge and am going to stuff it with peppers, onion, spinach, and cheese. I'm thinking Friday will be the big day.
I toyed with the idea of mozzarella cheese, sundried tomatoes, diced peppers, for a pizza themed one, or asparagus, spinach, and crumbed hard cooked egg for a spring veggie idea.