I was just wondering if there were any plans to make it easier to do this? Currently, as far as I can tell, the only way you can do this is to extend LeftAndMain, add some extra CSS files and overwrite the current styles. This doesn't feel like the most efficient way to skin it.
It would be nice if you could add a "cms" skin to your theme, or maybe to your mysite and the sit would look for it. Or can you do something like this already and I am missing it?
Well you can template modules like the forum by defining a subtheme like themename_forum and copying template files into the revalant locations so I don't see why you couldn't do a themename_cms/ folder with the templates folder. The CSS / image / JS paths are all probably hard coded but you can define a editor.css file in your theme which the CMS will load, using this you could override the styles.