And as I am not much involved in the development of the game anymore, but my contributions might be usefull for someone else, here they come. All these images are licenced under the Creative Commons Share Alike 2.5 licence.
These tiles are based on real public domain satelite images that I manually edited to create seamles interaction withanother. May be usefull for other types of game.
Never realy finished these, but at least they work.