Lots of different things work great as dippers. In addition to tasting great with chocolate, the foods need to be dippable either on their own or with skewers. Many fresh and dry fruits work great for dipping. Consider strawberries, bananas, pineapple, skewers of smaller berries, or dried fruits such as citrus or kiwi. For a salty, sweet combination I like to dip potato chips and pretzels. Homemade or storebought cookies, pound cake, bar desserts all taste amazing when dipped into chocolate.