I bought GW's new paint Agrellan Earth, it is for painting bases. I was extremely impressed by the result; it was as good as they said it would be. I re-based some cowboys for a friend. I did it like this:
1) First I painted the base with dark brown and Stirland Mud.
2) Then I painted on a thick layer of Agrellan Earth.
3) After it had dried for an hour or two I glued on one (1) turf of grass and a few small rocks. Very easy and fast.
It is marvelous! I will re-base my Indians, but it could also be used for Dust Operation: Babylon.