Update: the new design which I mention is the one you're currently seeing.
When I recently redesigned ktheory, I used a php template system with the intention of creating multiple templates allowing you to decide the 'look and feel' of the site. It's not working.
I'm currently working on a new system, inspired by Hivelogic. In the end, ktheory will look the same, but underneath the HTML will consist of div and span tags, and the look and feel will reside in style sheets. The design could be changed by clicking a button.