Hey Frodo, how's your finger?
Actually, I've been doing some experimentation with different processes. I think it is best to establish what I'm going to do across the whole army up-front.
That said, I'm kind of moving towards the following:
Take the dheneb stone guys, and paint on some of the detail work. I'm using Adeptus Battle gray for much of this. I'm also going to get the exposed guts and nastyness with some oranges and purples.
After that, wash the whole model with devlan mud. Then I'm going to go back over the large surface area plates with a 50/50 mix of kommando khaki and white - it's a good off-white colour that doesn't have the same yellowing tint that bleached bone mixes have.
And then, after all that, I'll remove the rest of the salt, so that I don't lose the chipping/cracking when I build back up the off-white colour.