School Lunch Ideas

Hummus and falafel with cucumbers in whole wheat pita?
I guess it depends on what picky means...
check out bento boxes online - you can get these cute little molds that will shape hardboiled eggs into hearts or trucks - what kid can resist that? If you cut veggies into cute shapes, they will eat those too!
or onigiri (triangle rice patties) with a protein filling, typically tuna or salmon, but if your kids don't eat fish, you could do marinated and baked tofu diced up finely instead

baby carrots with hummus or yoghurt dip and tea sandwiches with jam and cream cheese
Nothing wrong with cheese, crackers, and sliced fruit!

Roasted vegetable sandwich - eggplant, peppers, zucchini + cheese. Any sort of mix of Mediterranean fare such as hummus, dolmades, pita, baba ganoush, veggies. Egg salad or pimento cheese sandwich. Or just a regular vegetable sandwich, often times I make a sandwich with shaved carrots, lettuce, tomato, peppers, avocado, cheese, or whatever is in the veggie drawer. Cold bean and cheese burrito. Onigiri are fun. Empanadas, tamales, cold frittatas, quiche or tortilla espanola. As mentioned previously soups in a thermos, vegetable, potato + leek, butternut squash, lentil. Couscous or quinoa salad, pasta. crepes. Veggie pizza or paella. Sesame or rice noodles, spring rolls.

A few more ideas:
North African Stew: http://food52.com/recipes/2488_tsorta_tfaya_with_couscous
Tarines with Avocado and Radishes: http://food52.com/recipes/5115_tartine_with_mustard_mayo_and_mashed_avocado_and_radishes_with_butter_and_salt
The ever-popular One Pot Quinoa and Kale Pilaf: http://food52.com/recipes/2434_one_pot_kale_and_quinoa_pilaf
And, of course, a hearty Minestrone: http://food52.com/recipes/4661_smoky_minestrone_with_tortellini_and_parsley_or_basil_pesto

These Zucchini Quinoa burgers are delicious in a sandwich OR on top of a salad: http://food52.com/recipes/18585_zucchini_quinoa_burgers