With Themes users can express their data more clearly. Themes are created by administrative users and are available to everyone using Ad Hoc reporting. Themes allow every aspect of the report to be styled according to your style guide. Multiple themes can be created, so differently styled Ad Hoc reports can be created. The Themes configuration is available to users with the Configuration permission.
From the overview, you can create new Themes and edit existing ones. The options menu allows duplicating or deleting themes as well.