background image management

I just learned Omega 3 in the past month and I'm totally a fan now. Kent Lester, another Omega 3 fan is using different background images for different pages per his awesome 1 hour and 17 minute presentation about Omega 3, See Vimeo at http://vimeo.com/38144774 I haven't yet contacted him about how he does his. The Contact page on his website is not configured at the moment (kentlester.com). (Kent, contact me and I'll show you how to make a fantastic contact page using webform module and views). Anyway .....