Client asked, “Can I have different backgrounds on different pages?” Well, sure, but it’s going to be something like conditional PHP code and CSS (“If on this page, show that CSS/background.”) etc. Which of course is doable, but wait … check the plugin directory and I find “Custom Post Background.” Does just what I was hoping and there’s even a friendly WP admin interface and better yet, it lets me use images from the Media Gallery. Gotta love WordPress.