I made something like this:
http://static.cmslog.com/testapp/google/terrain
What I want to achieve now is terrain map with grayscale styling like here:
http://static.cmslog.com/testapp/google/maps
For now I applied the same rules (saturation: -100 for all), but it doesn’t work. I can’t also achieve this effect here:
http://gmaps-samples-v3.googlecode.com/svn/trunk/styledmaps/wizard/index.html
Does anyone know, how to make terrain map in grayscale so it looks like this image:

I didn’t provide any code, as all I have is under links pasted above.
Also this method doesn’t work :/
- Sorry if links above will stop working after a while.
It does appear that Google do not allow [do not have the capability for] the terrain map tiles to show the land as styled. You can style everything but the land itself.
So: can’t be done. The Terms of Service only allow you to do what the API is capable of, and it can’t style the land in terrain maps.