We are vegetarian and our kids are too. I'll suggest some meals that are not just a plate full of vegetables that our kids really like.
Haystalks (Taco salad): This is a layered taco salad that each person makes for themselves. Layer: Fritos, refried beans, Cheese, lettuce, tomato, black olives, onions, avocado, salsa, ranch dressing/sour cream. These are the toppings I like, but you can add/delete whatever. If your kids miss the taco meat, Morningstar Farms (freezer section) has soy burger crumbles that you can season with a taco seasoning mix. They are very tasty.
Lasagna. You can layer with veggies or just cheese, serve with garlic bread, salad and steamed broccoli or other green vegetable.
Curry. Buy a mild curry paste so you don't scare the kids off. You can make a lentil or chickpea curry, or one with vegetables and potatoes (with coconut milk), that you serve over brown rice or quinoa. Make some samosas to go along.
Vegetable lo mein or stir fry - serve with some cabbage and carrot filled egg rolls. You can also marinate and fry some tofu for the side.
Also, as I mentioned before, Morningstar Farms makes some great soy based "meat" substitutes. Chicken nuggets, burgers, hot dogs, sausages, etc... These would be easy to heat and serve with your meal if you feel the kids are kind of missing out on something they're used to. They are not the healthiest foods, but better then the meat ones. :)
I keep a vegetarian blog with recipes if you're interested. Everything on there I feed my whole family. martasrecipes.blogspot.com