"Earth tones" leaves a lot of room for choice.
Since this is important to you, I suggest a sample panel.
We used a 48 inch square panel of plywood with siding and corner board
applied.
Small cans of paint are cheap and a panel this size gives a better
sense of the final effect than a chip.
The panel can be painted inside in any season and positioned to catch
the sun for different wall orientations.

TB