Thanks for the suggestion and for the beautiful skins.
I don't mind updating some skins, though I can accept only Silver Pangare for Gray Creme, and it won't have the red pigment at the bottom part of the body as our Grays do not have it at all. Real-life interaction between dilution and gray genes produces a white animal but let's imagine that dilution in this case has only partial effect.
We don't have the real color genetics here and the base colors do not represent the real situation, but let's still keep some basic genetics logic within the "base color - color modifier" interaction. Pattern genes can't have random effects on the different base colors. White piebald will be white in any case because piebald means the presence of unpigmented patches. Cream lightens the pigments (both red and black, we have the combined effect of the real cream and silver genes here) which are absent in white animal, so it will be white too. Right now the only out-of-logic coloration is Blue Roan and, to tell the truth, it should be changed to some kind of gray piebald.