Spaghetti and meatballs are great for dinnertime, but this meal staple is also a handy and inexpensive lunch option. Ground beef and pasta both carry low prices, and together create a filling meal that kids love. While you can serve it cold and it'll taste delicious, you can also store the spaghetti sauce and in a thermos to keep it warm until lunchtime. Then they can just pour it over the noodles and meatballs for a hot home-cooked meal right in the cafeteria. And if you cut the meatballs and the noodles up ahead of time into bite-size pieces, it will be easier (and less messy) to eat.