That would be tough, if we're talking my tiles, they are ofcourse not all in the same tone(limitation of taking textures from Google Earth). However, even if they were in the same tone one would have to create new transition tiles to blend them in properly, otherwise it would look quite messy.
I already made Korea as you can see in Wrench's previews, however again this is way out of tone of my other sets, it's even called Korea Autmn ;)
My best advice would be a whole new tileset made from GE, however as I expirienced on my own skin, creating the whole package (terrain and tiles and targets) is simply overwhelming for one person.
I started Korea one year ago and it's still not finished, although CA_Stary did the trees, if Wrench didn't came in with the targets I don't know if it would ever be finished lol.
This is also why I was thinking about how great would it be to have a dedicated terrain team - you know like "Terrain Factory" LOL. Would simplfy the terrain making a lot and provide more high quality terrains to fly over ;)