Preheat the oven to 350 degrees . Spread the walnuts on a baking sheet and toast, 8 to 10 minutes. Let cool, then chop. Meanwhile, in a small bowl, combine the dried blueberries and 1/2 cup hot water. Soak for 10 minutes to plump the berries.
Chop 1 cup fresh blueberries, transfer to a medium bowl and stir in the sugar. Stir in the remaining 1/2 cup fresh blueberries.
Drain the dried blueberries and add to the fresh berries, along with the walnuts, celery and chile.