In a large bowl, combine raspberries and blackberries; set aside. In a small bowl, combine sour cream and confectioners' sugar until smooth. Stir in the yogurt, lime juice, lime peel, vanilla and salt.
Spread 2 tablespoons sour cream mixture over each crepe; top with about 1/3 cup berries. Roll up; drizzle with remaining sour cream mixture. Serve immediately. Yield: 8 servings