J.B.
Whole cranberries are super bitter. I don't know how you would incorporate them into a dessert. Every cranberry dessert I've made either cooks the berries in sugar or uses sweetened, dried cranberries. Perhaps you can cook them in sugar first, then rinse them and add them in?
I just found this recipe for sparkling cranberries, which may be what you're aiming for - they are gently cooked in a simple syrup, chilled overnight, dried and then tossed in more sugar. They are very pretty!
http://www.101cookbooks.com/archives/sparkling-cranberrie...
ETA: you're welcome, glad to help. They look gorgeous - I think I might try them sometime, so thanks for inspiring me!