I've really fallen out of the habit of taking lunch in with me, but need to get back on it.
While the oven was on for last night's roast (and while I was prepping other stuff anyway), I chucked a load of veg in a roasting tin, and will have those with grains (one of those microwaveable pouches) and some feta (maybe a dollop of hummous) for lunch today and tomorrow. I did aubergine, sweet potato, pepper, red onion, mushrooms and cherry tomatoes.
Also very nice to do a salad base (whether that be traditional leaves, or grains, or maybe some edamame beans and peas, or couscous and roasted veg), and then pop a piece of salmon on top.
I don't really gravitate to salads in the winter, but in the summer I really love Cobb salad, also make a spring onion, edamame bean and pea with mint and feta, which is very popular.
I tend to think about what salads I would choose if I were buying from the supermarket or a salad shop, and then make it myself at home.