Unfortunately the work is rather more involved than something that could be automated. You're really taking the design ideas, rather than the just CSS code, and translating them so that they make sense in the context of Moodle. On the other hand, if you look at a variety of Wordpress (or Moodle) themes you start to see a distinct pattern, that basically suggests all you need is a header, a footer and a repeating vertical motif in between. I confindently predict that, as a result of the CSS changes made for 1.5, there will soon be a body of Moodle Themes from which to draw, and that subtle variations of these will suffice for most people. That was part of my thinking in choosing Kubrick, as the distinctive blue blob can be personalised with an image simply by uploading to the Moodle file area. The rest of the theme is non-descript enough for this to transform the look of your site.
My masterplan, which I've not had much time to devote to recently, is to take the Kubrick theme for Moodle and break it down into its component parts to make it easier to steal, leverage, and learn from individual parts of it e.g. you may want to have stripey tables and new-style tabs without 2-columns and fixed width.
Or, on a simpler level, you may just want to take everything blue and make it green, red, purple etc. Hopefully this kind of change will be so easy that anyone can do it since the color stuff will all be broken out and logically arranged together in a single file.
To test that I've broken it down properly, I intend to create a final Kubrick theme, and one based on it's sequal K2 and another popular Wordpress theme, maybe Fresh Bananas (can't quickly find an example but you can see it in the Wordpress theme browser if you select it from the dropdown). These will all be using the same 'foundation' CSS but with a different facade creating a substantially different 'look' without, hopefully, changing the 'feel' too much. I'd hope that theme designers would also be able to build on that same foundation (and contribute fixes to it where problems are found).
(I'll also need to take a look at the block column code before two-column themes can really hit the mainstream.)
edit: Miles's post appears to be linking to a variety of glossary definitions in the Thai Moodle course. Is anyone else seeing this? edit2: it's stopped now. Very strange.