Adding grass isn't as easy as it seems on world maps. It's an autotile that sits on top of a different ground than the green you see above. If you add grass, it replaces the green ground above with the different ground and grass on top of the new with a really nasty harsh border. Also, there are rivers, but just not through that area in particular. I've come up with a really nice solution, though. I've ripped the grass from the background of the other ground and I reduced the size 25% and have made and am working on many tiles that you can combine to make grass on the world map. Tall grass on world maps. It's actually pretty genius. In my game, whenever you step onto the world map, you become 1/4 the size you were, so that's why everything is smaller. I could have just ripped the grass no problem and started using it, but damn, it'd be like grass blades as tall the trees ;o - Also, since I'm reducing the size by 25%, I have MUCH more leeway with the 32 pixel grid. each patch is now only 8x8 pixels instead of 32x32. So I can make like mini-custom designs in a 32x32 sized grid that works perfect tiling with other 32x32 tiles of this grass. I don't know, after I put to use I'll take some screenshots and post it.
Anyone else have some ideas?