I agree pastas are very versatile.
Thinking in another direction...while I do not have the specific recipes at my fingertips, the following are all easy to prepare for pot luck
vegetarian chili,
eggplant parmesan,
hearty soups like potato leek, mushroom barley or butternut squash come to mind...just substitute vegetable stock/broth for the chicken stock/broth.

Oh and don't forget the portabella mushroom...and Ratatouille.