There are a million casseroles that call for cooked pasta as an ingredient. Even if it's not the right shape, just cut it into small pieces and it will work. Then there's pasta salad. Chop up your favorite salad vegetable and toss them with the pasta and your favorite dressing. Lastly, make your favorite pasta sause and while it's still simmering, add the cooked pasta to heat through. It's almost as good as fresh.