Are you a vegetarian? I have a really good recipe for tofu (w/ a little ricotta cheese added) stuffed shells.
I take two 28oz cans of chopped tomatoes and heat them in a sauce pan w/ a little sauteed onions, garlic, basil, oregano, salt and pepper. Simmer about 15-20 mins.
Then, in a food processor, process a block of pressed and drained firm tofu, about 1/4 cup ricotta cheese, a package of frozen spinach that has been thawed and drained, and some garlic, salt and pepper to taste.
Boil the pasta (stuffed shells, but you can also use manicotti) while this is being done. I usually don't cook them the entire way because they'll cook a little while they're baking.
Lightly spray a 9x13" baking pan. Pour some sauce in the bottom of the pan. Fill the shells, and then pour the rest of the tomato sauce over the shells. Cover with foil.
Bake at 350 for about 35 mins, or until hot and bubbly. I usually put some shredded mozz cheese on top at the end and bake uncovered for 10 mins or so.
(I'm pretty sure it's 350 degrees....I'll have to double check on that one)