I was going to post the same question!
It is so annoying cooking something nice and then having to reheat it at work, I do 3 Lates followed by 3 Earlies each week so constantly trying to think of new things.
A few favourites that I bulk cook and that also freeze well are chilli, sweet potato and spicy bean stew, lasagne, casserole.
Stuffed peppers heat quite well, I cook a pepper halved for about 10-15 mins, I then stuff it with Batchelours savoury rice (which I've cooked but leave more water than normal so it reheats better) and some feta cheese, I then put back in oven for another 10-15 mins until the feta is browner. Any rice that didn't fit in the pepper halves I put in Tupperware and then put stuffed peppers on top.. Lovely and quite quick to make.
I find pasta isn't brilliant to reheat, always looking for new ideas so anticipating replies to your post as well x