Welcome to the forum Voidwalkerj62.
It sounds like your wanting to build a camouflaged gun so it blends in with the snow?
I might be wrong but I really doubt that anyone here has tried doing that but, you never know until you ask.
If that is what you want to end up with, go for it but remember, you probably won't be able to sell it for much more than scrap prices.
Getting to my own opinion, I don't think you will see any benefit from camouflaging the stock, even if it is with something white.
Deer and other critters are use to seeing dark wood colored things sticking out at all sorts of angles in the wild. A brown stock would just look like another strange shaped limb.
As for darkening the metal, most of us prefer browning but bluing works too.
If you use a solution that rust browns the barrel it not only ends up brown but it is a soft, non-reflective finish so it will blend in nicely with natural things.
You probably don't want to leave the barrel in its natural steel color, usually referred to as "being in the white".