Kids will love to help put a relish tray together, and with the convenience of being able to purchase prepared cold veggies, these days, it's much easier than in my childhood. A few basics include baby carrots, celery sticks, chilled olives, chilled midget pickles (dill and sweet), and other simple favorites, if you so desire. Ages 8 and up can usually operate an electric can opener, but do supervise the handling of lids and the draining of liquids, if you aren't sure. Jars may require an adult or teen to open. Otherwise, arranging of relishes can be a creative endeavor.
There are many types of relish trays to work with. If your family enjoys routing for a fave football team, you might want to do relishes on a football themed serving tray, for fun. Some families create a huge tray of veggies, and others section them off into small arrangements to place directly on the table. Color coordination is great, but clear crystal relish trays, or elegant Nambe pieces can be very pretty.