Yes, Unearth really is getting some great results already.
Version 0.11 came out last week, and you can now make a map using an image.
You can also use different images for one map.
Made this one today.
Well, working on it. It still needs more editing and a script.
Portrait of Peter Molyneux in a Dungeon Keeper map.
Made in Unearth.
I used several color reductions of the image, to get rock and gold where I wanted, with these different 85*85 pixel images.
Works for me.