From the CSS Zen Garden: a liquid design that is based on em and ex units and therefore grows and shrinks in layout along with a changed font size. That might be a usable basis for my blog, because it's precisely the fact that a fixed design doesn't respond particularly well to font size changes that bothers me about Kubrick.
Now I just need to figure out how to implement it properly. Above all, I'll probably have to incorporate the header graphic quite differently — images just don't scale sensibly with this approach. Let's see if I feel like tinkering with it at some point.