My kiddos are both total fruit bats so I'm not much help with that one.

But as far as lunch goes, until recently dd always took a hot meal to daycare (she only wants sandwiches now because apparently "that's what all the other kids have" - talk about peer pressure lol)
Some things I do

tuna mornay and rice/macaroni
apricot chicken and rice
spaghetti bolognaise
vegetable casserole or ratatouille
mild pumpkin and chickpea curry
pasta salad (good for warmer weather)
zucchini slice (freezes well, so I just cut into cubes and pop in lunchbox frozen, and it defrosts by lunchtime)