It's going well,at the moment I'm gathering tiles that fit and editing some palletes but here is what I have so far:
http://i49.*.com/wu5hxv.png
It's a pretty old screenshot from an old base of mine but I'm just starting off from there and adding different trees and such.so yeah,I'll show you some updated screens of it later.Not sure if you like it enough to use it for yourself,I have a few other ROM bases I made before.
http://www.romhackersonline.com/social/pages/54/
http://www.romhackersonline.com/social/pages/53/