Hey, I have great holiday news! I'd like to say it comes direct from my own brain, but a colleague clued me in. :) Here's what she says:
You CAN change the background of category pages!
Category pages get assigned a unique body class, which can then be
targeted via CSS.
For example, this page:
http://riverwayranchcamp.wordpress.com/category/pic-of-the-day/
.... includes the unique class
category-pic-of-the-day
.....as part of the body tag here:
<body class="archive category category-pic-of-the-day category-22003
logged-in admin-bar no-customize-support custom-background no-js
typekit-enabled debug-bar-maximized highlander-enabled
highlander-light custom-colors">
so it can be targeted in CSS with:
.category-pic-of-the-day {
// unique background stuff here
}
I hope that helps :)