I little while ago, I posted about my progress on a brown theme, EarthyTonez, which I'm pretty happy with it. Recently however, I read over in the art wiki that Ubuntu 9.10 is moving away from brown.
I figured I'd start playing with the concept of thinking outside brown and based (loosely) on the palette, here's what I've come up with in my vision of a darker theme for Karmic Koala.
I based it on my EathyTonez theme and customized the colors further with gnome-color-chooser. This theme is not quite ready as I've only been working on it a short time but if you're interested, and know how to use it, you can download the gnomecc file here.