I think one of the best ways to help a "picky eater" learn to try new foods is to invite the child into the kitchen to help. Few children can refuse to try something they have helped to prepare.
Cream Cheese Fruit Dip
1 (8 ounce) package cream cheese, softened
1 (7 ounce) jar marshmallow creme
1/2 teaspoon clear vanilla extract
Food coloring (optional)
In a medium bowl, beat cream cheese with a mixer until fluffy. Add marshmallow creme and vanilla extract; mix until all ingredients are well blended. Optional: a few drops of food coloring may be blended in to add desired color to the fruit dip. Serve with your favorite fresh fruit.