True blood parrots should be eugenically bred to look like that. So genetics plays a huge roll. "Blood Parrots" (as in the fake ones they often sell at walmart) are hormonally enhanced orange fish, or occasionally dyed fish. Either one will fade with time. Even true blood parrots will fade once they are old, most fish do. Like Marius said, high carotene food helps a lot (blood worms, krill, prawns)
IMO, I think they are all deformed and ugly, and would go for the ture parrot Hoplarchus Psittacus any day over them haha. I guess beauty is in the eye of the beholder though. It's like someone tried to make the cichlid equivalent of the fancy goldfish and it went all wrong hahah.
I would like to see updates as well.
JMorash