One thing that has helped to up the veggies that my kids will eat is to have build-you-own dishes that include lots of different veggie choices. We do taco salads or nachos almost once a week and I put out tomatoes, peppers, cucumbers, scallions, radishes, celery, carrots, olives, and any other veggie I can scare up whether or not it's traditional. With enough sour cream my youngest will even eat some.
We do Asian lettuce wraps the same way - seasoned ground beef or turkey served in romaine leaves with carrots, celery, cuke, peas, etc.
One thing I picked up from the THM cookbook is to use okra in smoothies (mainly in place of banana) and to thicken sauces. It works particularly nicely in crockpot dishes and soups to thicken and keep them from breaking. My 10 year old hates the sight of okra, but loves my tomato soup and I just don't have the heart to let her know that it's about 1/3 okra.