I had looked into showing Seramas not too long ago and found a list of APA recognized breeds and varieties. On there it said that white was the only recognized variety. Here it is..
http://www.amerpoultryassn.com/PDF Forms/APA Recognized Breeds and Varieties Sept2012.pdf
It is from 2012, but I am pretty sure it is still accurate, it is still linked on their website.
I would assume that, like Silkies, you could show any other color as AOV but I am not positive
What is "AOV"? There is no class called AOV at a sanctioned APA/ABA poultry show.