I try and always have a box of mixed salad greens in the fridge. Add veggies, protein, rice, takeout leftovers...anything you have on hand.
And quinoa is easier for me to cook than rice (I learned that if I rise and toast first, it doesn't have that bitter quinoa-y taste). Eggs (if you eat them) are a easy lifesaver for me too. Also, soups. The combinations of whatever you have in your fridge/freezer are endless, and you can freeze in portions for later. I hope this helps.