I masked off the areas i wanted to remain black and then sprayed several coats of Duracoat bedliner(after wet sanding),I let that setup for 2 days in the sun and then used Krylon Cammo SP to do the "sandstorm" color combo(khaki and brown).Then remove the masking tape and your done.Here is a close up pic of the texture you can get with the duracoat by spraying in the heat and keeping the can WAY back from the stock.
I love the texture i get this way,the whole stock feels like a piece of that grip tape you put on running boards ect.