i am just curious, not interested in breeding, but is there such a thing as a siamese budgie or a himalayan budgie? i had a budgie girl who had a gorgeous taupe coloring on her face. new feathers would come in white, but they would turn taupe in a matter of days, naturally.
this was from when she was still growing up but the coloring never really changed other than no stripes on her forehead.
(she has since passed on, but i was her only love and she wouldn't give her cagemate the time of day if she didn't have to)