I stay up late and bake at night. Our crockpot really puts out too much heat for me to want to use during the day.
Last night I baked a chicken, brocolli, and rice casserole at 10pm and then put it in the fridge overnight. It reheats well so its a good choice for this.
I love grilled food so I will do a few different kinds of foil dinners. Veggies on skewers are great too. You can experiement with sauces.
We like salad in our family too. So I will cook up meat at night and then the next day we top our lettuce and veggies with the meat and whatever dressing goes well.
We are getting CSA this year so we are getting lots of veggies. A light steam doesn't produce much heat. Then they are easy to top with a variety of sauces (teriyaki, aminos, butter and parmesan, etc) and you can serve these on rice. This is good cold or hot as well.
Other cook ahead foods I do often are baked potatoes (which can be topped with anything) and quiche.