Can you say "megatexture"?
http://farm3.static.flickr.com/2780/4417933200_6290ff2a35_b.jpg
http://farm5.static.flickr.com/4054/4417934246_e22356fc47_b.jpg
In answer to the previous post, getting them in is pretty much the same as any other texture, though you will need a magic map file because of the size difference. I get the nvidia DDS plugin to create the mipmaps while saving, and that's about it. The one problem I'm having at the moment is that the billboards start reverting to the vanilla ones after about 15 minutes of driving, and I've no idea how or why that's happening. The vanilla textures aren't even in the bnk files anymore. :confused:
mod edit: Please don't post pictures over 350KB, thanks!