Well maybe I won't. Took video and not pics.
Anyways, I started with green, using a sponge cut in strips. I'd spray a puddle on a cardboard box the dab it and dab on the stock in the pattern I wanted. It took several coats to cover the black.
Then I went and covered alot more with the off white again in the same kinda stripe pattern. Then hit it with the gray and followed it up with black over the black stock and white/gray till I got the look I was going for.
I found that the smaller the sponge I was using the easier it was to get what I was looking for.