Most of us use procedural techniques to produce realistic results. It is very refreshing to see them applied to achieve a more abstract look. To pull this off is very difficult, you need to combine a very developed artistic sensibility with programming skills.
I have been following this project for a while now: Voyager3. I like very much the feel of the environments. It reminds me of beautiful game art like the one in Sword and Sworcery and Journey.
This is concept art, but it you check the site you will see they are getting close to achieving this look. The project is fairly new, but I think it has great potential.