Blueberry & Green Grape Jewels

2 cups light sour cream

¼ cup brown sugar, firmly packed

1 teaspoon vanilla extract

2 cups blueberries

2 cups seedless green grapes

Stir together the sour cream, sugar, and vanilla. Chill at least 30 minutes for flavors to blend.  Set aside 1/4 cup of the blueberries. In a large serving bowl or individual dessert dishes, combine blueberries and grapes, then top with the sour cream mixture. Garnish with reserved blueberries.