Random Header Images

Is there an easy way to set up multiple rotating/random header images for my site? I have many variations of the logo that I’d like to randomly show to visitors.

I saw the plugin Random File (http://wordpress.org/extend/plugins/random-file/) which it seems I could use to set up a directory of images to rotate, but then I need to insert that code into the theme.

I was wondering if WPMU has a way built-in to already do this? or their own plugin? If not where would I add the code for the header image in let’s set Buddypress Social? is the location consistent across all WPMU themes?

Thank you.