Thaw frozen blueberries and drain, if using. Chill thawed blueberries until serving time.
In a small bowl stir together apricot nectar, honey, and vanilla.
In a large bowl combine apricots, apple, grapes, and fresh blueberries, if using. Pour honey mixture over fruit; toss gently to coat. Serve immediately or cover and chill up to 4 hours. Just before serving, stir in thawed frozen blueberries, if using. Makes 6 servings.