Right update 1:
I've finished the horse for my Liche Priest, Khonshotep. Here it is:
I sprayed the model white then gave a heavy wash in all the right places. A direct appliance of devlan mud to the cracks only shaded it more. I then painted bleach bone, leaving the recesses dark. I then finely hilighted with skull white. The base is a covering of sand with watered down PVA brushed over, then a bestial brown base coat. I then heavily drybrushed snakebite leather, then drybrushed bubonic brown, then lightly drybrushed bleached bone. I stuck on some Galeforce9 straw static grass and a few stones painted to look deserty.
Keep watching out for more!