Cold meals for work. Any ideas?

I usually eat nothing at work, I eat breakfast at home and after work is actually eaten again at home. But if I eat at work, I usually take a small fruit salad, consisting of grapes, blueberries, raspberries and strawberries, or I eat a protein bar at work from time to time. Quite often, I’ll take a bun or bread I’ve made myself with (mostly full-grain bread/breads or breads of liquors/breads), then fill it with avocado and tomato, or with some fresh cheese, tomato, salad and cheese.