Well..here's a few I came across that might be suitable..
http://custom.simplemachines.org/themes/index.php?lemma=2428 - the chocolate variation probably most fitting.
This is the one I picked for now. I'm not completely happy with it, I find it is way too dark. Anyone with a design background feel like improving the colour scheme? You can download it from up there and rework the CSS files.
