Combine cranberries, apple, celery, grapes, raisins, walnuts, sugar, cinnamon, and yogurt. (I chop cranberries in a food processor, and it works great). Toss to coat. Cover and chill 2 hours.
Stir just before serving.
Garnish with frosted cranberries and mint leaves if desired. For frosted cranberries, wet cranberry and roll in sugar.