We're bad, I admit - we allow books at the table to "distract" the kids into eating more. also, counting down ("only 5 more bites"), eating together as a family so they see we are all eating the same thing, "hiding" healthy food behind more "appealing" food (e.g., broccoli behind pasta), fun shapes (baked rice balls with vegetables). Tofu and bread are very popular in our house.
also, seeing other children eating "fun looking" food like grapes and blueberries can help. Good luck