I WAH. My lunches vary, but tend to be similar for any given week. Here are some of my favorites:
This week, I diced and roasted a squash, and made a homemade dressing. I did all of this on Monday and have been eating it all week along with a tuna salad sandwich. Here is the recipe:
http://www.foodnetwork.com/recipes/ina-garten/roasted-butternut-squash-salad-with-warm-cider-vinaigrette-recipe/index.html
TJ's veggie burger on a multi-grain slim. Side can be soup, chips, avocado, or side salad. One week I made a kale salad and ate that with a veggie burger all week.
I will roast a chicken on Sundays, then use the leftovers for chicken salad. Get all ingredients ready and chopped on Monday, then it's easy to throw together each day. It can be anything, but one of my favorites is: lettuce, chicken, feta, pistachios, grape tomato, TJ's champagne dressing.
Sometimes a simple deli sandwich and soup.
Leftovers! DH almost never eats leftovers so I have free reign over those for my lunches.
You could take any of the above and simplify -- for example, roast a squash and just eat that plain (or with s/p, olive oil, whatever you like) along with a simple deli sandwich.