My dh doesn't want to use the microwave either (???).
I've sent sandwiches (I know you said no to this), salads - basically greens, tomatoes, whatever leftover meat we had for dinner the night before, cheese (chedder or feta), sunflower seeds, raisins, craisins, whatever I felt like dumping on. I included a little container of dressing - sometimes used, sometimes not.
I've sent just whatever we had leftover (rice, beans, meat) all in one container. It was his choice not to reheat and just eat cold.
Now he is on a must-eat-red-meat-and-lots-of-it kick. I'm not fond of red meat, so I'm not generally involved with his lunch anymore. He smokes a brisket every month or so, cuts up pieces that will last 1-2 days, packages them individually, freezes them, pulls one out on his way to work, grabs an apple and calls it good. This sound horrible to me, but he is happy, so great.