I used a Krylon spray that is almost an exact match for the old citadel Graveyard Earth for the base color (I don't remember the new citadel color equivalent, maybe Steel Legion Drab?) followed by an airbrush shading with some Charadon Granite (perhaps my favorite GW paint color ever). I then airbrushed some highlights with a mix of Bleached Bone and Steel Legion Drab, and ended with a light drybrushing using Citadel Dry:Terminatus Stone with very pleasing results. I really didn't think I'd find the new Citadel Dry paints very useful but they seem to work great on terrain for my purposes.
I think I'll try to give my Citadel Wood Kit, that's been sitting around for the same amount of time, some TLC while I'm on a roll.