KFC is a good idea, get different kinds of wings or something. Also you can go to Wal-mart and they do sell wraps and subs, slice them up, toothpick them for individual use.

Or maybe for something different, a Bar-a-Que place and get some ribs, sliced pork, chicken, beef and some rolls, where they can make there own sandwich.

Even Chinese would work, egg rolls, chicken on a stick etc etc.

As you can tell, I'm trying to think of anythings and everything.

I've sort of been in your shoes and what I did was think of all the restaurants in my area, where you can do pick up and think about whats on their menu that can work. You'd be surprised what you can come up with. A few onion blossoms from Chills, a few of the sampler plates from there also, subs from subway and chicken wings from KFC, deli meat etc. and we had a party.

Hope it all works out for you.