Pasta salad would be easy and great cold. You can mix bow-tie pasta with chick peas or kidney beans with a few different vegetables. I would be as selfish as you want, make something you like and enjoy so that you have something to eat.
Awesome idea, thank you!
I did this for my work potluck too. We go to this great restaurant and they have this Vino Bambino salad that everyone loves. I veganized it and I swear they didn't know!
Also, do you have a crockpot? It's a great investment. You could make some vegan chili and cornbread and it can sit in the crockpot heating up all morning (always best the next day anyway).