Re our post on Blueberries today, I found a source for the wild type, non-hybridized highbush blueberry.
I would suspect that these would naturalize well, given the right damp, acidic and sunny location. (The cultivated blueberrys do not seem to naturalize.) In fact, I have a spot that might work well for them, but whether the soil there is acidic enough I do not know.
Come to think of it, if it were just right for them, they would probably be there already.