We went (mostly) pescetarian almost a year ago, for health reasons. DH and I don't do dairy, but the kids still do if they want it. Some great recipe sites I like:
Minimalist Baker
Post Punk Kitchen - theppk.com
Vegan Lunchbox
OhSheGlows
I experiment with a lot of different foods, too. DH is Jamaican, so I make sweet potato pudding, cornmeal pudding, red pea soup (without meat), curry fish, rice and peas. Also like to try Indian curries (on the less spicy side) with veggies or chickpeas. Asian stir fry with tofu and rice noodles. Chili is good. Soup with lentils, split peas, barley, carrots, potatoes, onion, garlic, basil, bay leaf, and tomato paste (or ketchup). Quinoa.
Great, super-easy tacos: Cook a can of black beans in half as much salsa and 1.5 tsp cumin, until it's not watery and the beans are soft. Mix in some sauteed chopped sweet pepper and onion, and some corn. Eat over rice or in taco.
If you're tired, PBJ or mac n cheese is always a well-received go-to.

And like someone else said, avocado is great for those healthy fats, my kids devour it.