They seem to all be going to this gray'd blue/green/pink palette.
You've just described "every pale colour that exists". Every pale colour is either pale blue, pale green, or pale red ("pink"), or some combination of those. So in my opinion that means the artists are doing a good job of including every colour!
If I were to post every single Albino/Melan sprite with a green and purple coloration, it would be so, so many. I actually might do this later but I already know this will take a couple hours and I have obligations. (And I
personally have a strong distaste for almost every single one of them.)
As an aside, I feel the need to point out how silly it is that the fire is shaded on Hisuian Typhlosion. The rest of the sprite is fine but it's so stylistically strange when compared to Typhlosion or other Pokemon with fire.
