Blueberry Ambrosia

1 cup blueberries
1 cup peaches, cut in bite-size pieces
1 cup pineapple, drained ( crushed or chunks )
1 cup small green grapes ( or Emperor grapes,  halved and seeded )
2 cups diced marshmallows
1 cup sour cream
2 Tablespoons sugar

Mix all ingredients in a bowl.  Let stand in refrigerator at least an hour, stirring occasionally.
Makes 6 servings.