One of the things that I think would alot to the client graphically is better trees. As I have said on more than one occasion I really know little about modeling and such, but for those of you that do and use blender... this looks promising.
http://www.geocities.com/bgen3/
I tried it with and was able to figure out the basics but it was my first time ever using blender and my first time doing a model in prob a decade or so... anyway this is what i able to come up with my limited knowledge and skill. Maybe one of you guys that know what you are doing could take a stab at it with more impressive results....