Oh, goodness, how many times have I asked this same question!! I've had a hard time finding lunch ideas. I used to try to do real "meal" lunches---leftovers from the night before, frozen WW meals, etc.---but they always left me hungry OR I found that when lunchtime rolled around I didn't want them. (my husband says I am one of the pickiest eaters he knows, lol).
So now I am back to my good old standby...I have always been healthiest and done well on WW when I eat this for lunch:
--1 stonyfield farm fat free yogurt (I use stonyfield because they add natural fiber, which means low points!)
--1 large piece of high-fiber fruit, such as apple or banana
--1 serving of high-fiber grains, such as healthy granola, trail mix, or a slice of hi-fi bread w/ a dab of peanut butter
--a baggie of carrot slices or raw broccoli, to munch
--3 squares of organic dark chocolate, as my after lunch treat
This lunch gives me protein, fiber, good carbs, some good fats from the granola/trail mix, and I never feel deprived. Sometimes I'll also add a square of Cabot 75% reduced fat sharp cheddar. It's easy to shop for too---when I go shopping I check what's on sale, and I make sure I have 1 fruit, 1 veg, 1 protein, 1 dairy, and 1 fiber item for each lunch.
Plus, none of these things need to be heated, and at my job I sometimes have a hard time getting a free moment to run to the microwave.