Need lunch ideas

I try to pack a lunch for my husband and I everyday because it's cheaper and healthier. Here's the problem, my husband is tired of lunch meat sandwiches (I am too) and refuses to eat leftovers because he won't eat anything heated up in the microwave.

I make chicken salad with walnuts and grapes, but after two days he doesn't want that anymore this week. I don't know what I can make that isn't heated up in the microwave or a sandwich.

Any suggestions?

bon appetit