Considering where he was at the beginning of the year, Parker Meadows would qualify as a bright spot IMO.
Not necessarily an all inclusive list, and others MMV, but here's a few I'd say qualify.
Upper Minors: Wenceel, Carpenter, Meadows, Lipcius, Hill (as we saw yesterday), Flores, Olson, Bergner
Lower Minors: Ty Madden, Brant Hurter, Colt Keith (when he wasn't injured), Josh Crouch, Izaac Pacheco, Manuel Sequera (good power #'s, needs to make more consistent contact), Garrett Burhenn
The big question I have is with the some of the position players who have broken out (ie. Carpenter) or have seen their stock rebound (ie. Wenceel, Lipcius, Meadows) is whether they can go beyond the expectation of being slotted as utility/depth guys at the big league level. Or in the case of Carpenter the perception of being a AAAA guy. Skeptical, but who knows.