Hi Dave! I was just thinking, since I have no artistic talent whatsoever, and I know you mentioned in another post that you would be making more tiles/terrains in the future, I thought I'd throw a few ideas your way if you don't mind!
I 'need' a L2 rough rock wall(both brown and dark grey/black) to simulate mines and lava caverns respectively. It would also be cool to have some L1 floor terrains that would allow me to create lava rivers in my maps (you know, like half lava-half sooty shore).
I hope you don't mind me suggesting these. I'm not trying to demand them, I just thought that with these terrains I would be able to make some REALLY cool mine maps and lava maps!