Deco

Besides aiming to fully theme Drupal and its core modules it offers advanced layout options based on regions:

* Single sidebar layout: left or right sidebar.
* Double sidebar layout: left and right sidebar.
* Double right sidebar layout: small secondary right sidebar and bigger normal right sidebar.
* Triple column layout: when all three sidebars are used they will be rendered as three equal columns with the content beneath it.
* Featured region: A region between header and content for the mission and/or featured content.
* Bottom content: A region between the content and the footer for featured content and/or a site map.