No, I like the dispatch design and to design it completly new it will take time. So for now I would improve the dispatch design. So the only possibility is to Customize the design and set background in wordpress-CSS-Editor?
The Dispatch uses the header but it use it in the the images-teaser and not at the top of the page..
BTW: The header element would show me my background with the menu, so at the bottom of the site logo ๐
Ah, and I discovered, that if I want to use my old theme for a few days I am not able to restore the full design. Some of the parts are from GP Premium but I deactivated it.