:iagree: Anything can be rolled in those things! Dd was at camp last week and she rolled up white bean dip with cucumbers, cheese, green onions and lettuce; left over black bean taco filling, peppers, onions, cheese and lettuce; cream cheese and chive spread with carrots, pea pods, onions, and lettuce/spinach mix. And I know she took some pb&j sandwiches, too. She usually packed some carrots or pea pods or broccoli/cauliflower and a piece of fruit, too. We froze some bottles of water (we dumped a little out before we put them in the freezer to allow for expansion) and that's what she used as an ice pack, and then drank it as it thawed throughout the day.
ETA - and oil/vinegar based pasta and veggie salads. They should stay cold enough with the ice pack.