Being a college student, I'm naturally broke. Thus, my pantry is usually stocked with $1 boxes of pasta and not much else. This is great except for the fact that I never invest in pasta sauce to go along with it. So here's a trick I always use. Instead of buying sauce, grill up vegetables in a pan with some olive oil and use them to top your pasta.
This is also a great way to get rid of produce before it goes bad. I love cherry tomatoes but can never finish a whole package, so the other day I chopped them up along with some leftover sage, grilled them for about 10 minutes, and seasoned with salt and pepper. In the time it took me to boil water and cook my pasta I had a big healthy meal prepared, and I didn't even have to go to the store!