We're completely grain-free in our house. For take-to-work lunch it's usually a salad with lots of different veggies, boiled egg, some kind of meat, and just a bit of olive oil and vinegar. Sometimes nuts or sunflower seeds. The oil and protein help keep it satisfying (veggies alone will fill up your stomach but won't keep you going for long). If it's cold weather, soup, stew, or chili happens a lot too.
At home where it's easier to cook, lunch is usually leftovers or a pared-down dinner (steamed veggies and a simple piece of meat, something that cooks quickly like chicken breast tenderloins or pork chops).
If you're wheat-free, bread is just really hard to get right. I have a friend with celiac disease who tried all sorts of different gluten-free breads and was disappointed with every one. Pasta wasn't so difficult to find, but bread was a no-go. We don't eat any grain at all, so it's simply not a question.
Hope this helps!