I always have a bowl of fresh seasonal fruit in the middle of the dining table, so it's always in our eyes first instead of junk food snacks. Also, we tend to eat a piece during/after our meals because it's there all the time. We eat canned fruits with our ice-cream or just by themselves. Always pack some in take away lunches, or to munch on long drives. Even dried fruits, like raisins, sultanas, apricot, etc. can be added into your oatmeal or cereal, or just as a snack.
Vegetables get added to most meals--fresh, canned, or frozen. It depends what I'm cooking and how much convenience I'm after. Usually add tomato, frozen mixed vegetables, and/or creamed corn to soups. Add different herbs to meals while cooking. My kids love having bite-sized pieces of apples or carrots as snacks, so I cut it up for them. A little extra effort, but worth it.