Here is a link that was posted on another thread for cold soup:
http://thepioneerwoman.com/cooking/2009/06/gazpacho/
I just made it today. We haven’t eaten yet, but I was curious and just tasted it and I think it is pretty good. That could be taken in a thermos to help it stay cold.
You could take an assortment of chopped veggies and cheeses and some hummus and pita crackers.
When we go for picnics I like to take vegeburgers and potato salad or coleslaw.
Burritos was the first thing that popped in my mind, but you are already doing that.
We make something we call haystacks. It is basically a taco salad built on the individuals plate. Chips, beans, lettuce, tomato, olives, cucumbers, avacado, onion, salsa, cheese, sour cream. If everything is chopped ahead of time, it is easy to transport. Any leftovers could be mixed together for a salad or to add to a burrito.
Taco salad, just add the chips when you are ready for them.
I don’t know what this is called, but it tastes good room temerature/cold. Cook some colorful noodles. Saute some zucchini. Mix those together with sliced olives, artichoke hearts and pesto. I take this to potluck all the time and don’t reheat it before the meal. Everyone really enjoys it. You could also add other veggies like broccoli, yellow squash, etc.
Hope one of those sounds good to you!! It is so hard to always have to pack meals around. It sure is nice that you won’t have to pack the plates, too!!