C.F.
Something I always liked to do with my parents when I was a kid was to make a BIG salad for dinner. We would put all kinds of different toppings on it. We had feta cheese, pickled beets, sometimes a bean mix, artichoke hearts, tomato, olives (both green and black), cabbage, a nice leafy green for a base (sometimes we even used spinach as the base) and always carrots and mushrooms. All nice and fresh. They can be a little more expensive when you buy them at first but it is because you will end up buying enough that you can make a few meals out of it so in the end it will end up cheaper.
That's as vegetarian as we got though. My family was a meat loving family. Good luck. It sounds like there are some really great ideas.