I finally finished my wordpress customizing and updated the site with a new theme. What you see here is a K2 r160 theme with customized CSS and the additional images. The only thing I had to change in the PHP scripts was the display of the categories in the sidebar which was limited to certain pages. So the upgrade to the next K2 release will hopefully be seamless. The archives page doesn’t work at the moment but I’ll have a look at that in the upcoming week.
Here is a screenshot of the new design for documentation purposes: