[Imperialistic]

Yeah, like said.. It all depends on which kind of "theme" you're aiming at.

You could use patches of grass and flowers, for a basic theme.

For Forestry I would use alot of grass, and swamp/tall grass.
etc
etc

Just use your own imagination, doesn't matter which tile is favored over one another, because usually you can use any tile and add some imagination and make it really good. I usually judge levels on creativity and dedication other than appearance.