It doesn't really matter. Real world shooters go by the 60-40 rule anyways. 60% natural foliage from the AO and 40 jute or other material already attached to platform.
I'd use more tan and brown, maybe like 60%, then some green here and there. You'll be mostly in the dirt, which is brown. They are just fun to build. Don't put too much on, just enough to break up your form. By the time they make you out, you'll have placed your shot.
