The Green and the Gray.

[StayPuft]

Even though dead bodies don't actually turn green, I've always liked the supernatural look of the green, decayed zombie flesh. So, for my zombies (standard zombies anyway) I do about half of them in an undead green flesh color. The other half, I do in more of a normal flesh tone that is just a little pale. Once they are splashed with blood, they look especially zombified.

So far, I've only painted my Zombicide zombies. (I recently started on Toxic zombies that I do with a shade instead of a solid color, and it is sort of a neonish green.) I've yet to paint any of my Last Night On Earth stuff, but I'd probably use the same philosophy of half and half.

I wouldn't mind doing other shades as well, such as the pale bluish others have mentioned, but I've just not yet run into anything else that struck me as a good shade for zombie flesh so far other than the ones I currently use.