Colours and Concepts

I can't seem to come to a decision when it comes to the overall colour scheme of my environment, sometimes I want it a range of greens and blues, and then other times I want it more copper colours, with a golden light. Then I saw some of the concept art for The Legend of Zelda: Skyward Sword.

I really like the watercolour style used  here - the way blue seems to seep into the picture, there's an old ancient rustic feel which I want to capture.

So I'm thinking I'll colour my tree and other components with a slight range of colours (as shown in my concept above -but stronger as this is quite faded and rough).