I don't think there are that many of these out there, and they haven't been around for long. It seems that when the diffused gene is first crossed into other morphs, the diffusion isn't that great. It seems to take a few generations of selection to get things on track. A good example would be granites (anery diffused). I wasn't a big fan because of the crappy diffusion most seemed to have, but then in '06, great examples were popping up all over the place.