This has already been covered by Kevin [here][1].  The minimal styling is provided to help style links and tags, but the rest is omitted to prevent lazy devs from copying look and feel.

What value link and tag colors outside the context of the rest of the style is questionable, in my opinion.  

I typically just use the icon or favicon to provide context.


  [1]: http://stackapps.com/questions/1069/what-is-the-rational-behind-the-chosen-sites-styling-info