Which is what I had to do for this design:

http://rappelzvideos.com

I had to change every template and the css. That site is version 2.6. I have not yet upgraded it to 2.7, nor do I have any immediate plans to do so.

I am finding, however, that 2.7 is a lot easier to work with since most of the design elements now reside within the css. YaY!