If you are having a hard time getting your kids to try different foods try purchasing foods from a specific color.
For example; eggplant, plums, grape juice for the color purple
Have the kids help you make the meals. If they are old enough to cook, let them fix the meal.
Make the table look awesome and fresh. Find some old bottles or jars. Paint the inside of each with your favor colors. Allow to dry. Place your favorite flowers in each jar.