In a small bowl, combine the pineapple with half the yogurt. In small wineglasses or juice glasses, alternately layer the pineapple-yogurt mixture, blueberries, and granola. Repeat the layering twice. Top each parfait with a dollop of yogurt. Serves 4. Nutritional analysis, per serving: calories, 233; fat, 3g; cholesterol, 0mg; carbohydrate, 49g; fiber, 3g; protein, 4g; calories from fat, 12%