For a pretty, single-serving presentation, layer the fruit and pudding mixture in parfait glasses rather than in one big bowl.
In 2-quart trifle bowl or clear glass bowl, layer pineapple, the 2 cups strawberries, the 2 cups blueberries and the grapes.
In medium-size bowl, with a whisk, whisk together dry pudding mix, milk and sour cream. Stir in crushed pineapple. Pour over the layered fruit. Cover and refrigerate for 2 to 8 hours.
To serve, garnish with additional strawberries and/or blueberries.