On my computers, this is the background:
It's been that way since I paid a random designer $5 to make me a glassy-looking purple planet... four years ago, or so?
I have the same facebook profile pic that I set when I joined facebook.
I have the same twitter profile pic that I set when I joined twitter.
I have the same myspace profile pic that I set when I joined myspace (but this isn't saying much, because I don't think I've logged into myspace since I joined myspace, someone else took the name spacefem and I figured the site was a lost cause).
I have redesigned spacefem.com several times... about every 2-3 years, I like to overhaul. But that's mostly just to keep up with web trends and clean navigation based on the new site content. My regular visitors always HATE it when I redesign the site... and for that matter, we have a strong trend against changing user avatars because all you really recognize is an avatar. Maybe the spacefemmites rubbed off on me and that's why I can't change any other pictures, anywhere?
Anyway the facebook thing definitely makes me a freak because people there change pictures ALL THE TIME. I refuse to give in.