This is a related post by Jeff Burnz that looks like it is more flexible and up-to-date.

This is my first entry as a member of OpenConcept. I hope I can contribute positively to the team, and I look forward to being able to contribute back to the Drupal community as well.

While working on the Ecosystem-Based Management Tools project, I was asked to implement a method to have 8 unique header images--one per section--for the custom EBMTools theme I setup. The client wanted to have specific images for each section of content, thus it made sense to match the themes to the taxonomy of the content.