My favourite (notice how I spelled that one correctly, hee hee) McMillan camouflage scheme is the Forest Woodland.
I've painted stocks and entire guns for myself and a couple of friends with Krylon's camo paints. However, I wouldn't feel comfortable doing it for someone I don't know. Also, the Krylon is less than durable.
I have found that Khaki with an OD lightly sprayed overlay was one of the best camo schemes for the foliage in this area. Sometimes, I use leaves and twigs, cedar sprigs work very well too, for overlay stencils. The objective is to make the firearm camouflaged and blended in with the scenery, not stand out.