Okay.. from my experience, I'm telling you this grass won't look as good as you think with the palettes and the trees. It's just too HGSS, and the paths-houses aren't HGSS styled, they are FR style.
Anyway, that's where I would put it too (And as a matter of fact, I was going to tell you about the grass. I adjusted its colours, but it made it too sharp. It was too light before.)
And as for the ground palette, don't worry mate, I'm going to make 2 palettes: One totally brown, exotic ground and one purple-brown-ish. The second is more natural, I have to say.