i recommend going to the library and checking out the college vegetarian cookbook. it is basically budget-friendly yet easy and healthy vegetarian meals.
beans and rice are cheap and together they make up a complete protein. lately i've been on a kick of black beans, brown rice, some canned or frozen corn, a little chopped up tomato and monterey jack cheese on a tortilla. (i put it all on the tortilla and broil it.. then roll it when the cheese is all melted.)
I also make a lot of soups/chili in bulk and freeze them in serving size containers.
Veg-Head Three-Bean Chili Recipe : Rachael Ray : Food Network this is the chili i make, which i could live off of. i also make a parmesan-string bean soup and roasted red pepper soup that are also awesome and freeze well! let me know if you want the recipes!
if you want to try any frozen veggie burgers, i recommend morningstar farms garden veggie patties. it's not all soy unlike a lot of other brands - it's actually veggies. they aren't that cheap, but i'd recommend getting one box so you always have something quick to go to in your freezer. (also p.s. to any other vegetarians, i recently learned burger king has this exact veggie burger on their menu!!!! so now i actually have something to order :))
i am not supposed to eat soy anymore, so i've stopped eating most imitation meats.. but there are a lot of meat "substitutes" if you want to try them. I have tried a few of the "chicken" nuggets and most aren't bad. and they're quick. just throw them in the oven. (i'd recommend the brand Gardein)
when i lived at school I didn't have a full, functioning kitchen - only a microwave... and the vegetarian options at the dining hall got old fast. I ate a lot of the "steamer" veggies with microwaveable brown rice. also gets old quickly so i feel your pain. i have so many amazing vegetarian cookbooks and dishes, but not many are college friendly. they require a whole lot of time and effort.