With the help of the entries in this lovely community I've got just about everything the way I want it. I swear I went through every post twice as I was tweaking the thing.
The one sticking point I've run into is a 1px white border that runs to the left of the subjects of posts on my LJ and my friends list. I did manage to change the color of a similar border alongside the posts themselves, but I've been staring at the css sheets until they're just a blur, and I can't figure out what attribute controls this.
You can see it here hhertzof. It's about 20px to the left of the vertical burgundy line separating the sidebar from the main page. It's just barely visible against the background color.
My other question is simple...I think. How difficult would it be (now that I've got the page the way I want) to take the custom css that I've created here and remove the Bunnylicious Blue base/reproduce it with no theme selected? I know I've got some commands in there that are used to cancel out items from underlying style sheets, so I'd like to eventually clean it up and remove the original theme entirely.