So, using custom css and the theme, it's quite simple to add a background picture to an area.
I'm looking for a way to do this using the User Interface, either via a contrib module or some other method.
A hero block may have a backdrop picture added to it. Consider giving an area a background image.
I'm willing to accept any of the following responses:
1) Is there a Drupal module that could be ported to do this?
2) Some rudimentary code for creating a module for this functionality
3) Some inventive use of basic characteristics that might enable this.
The use of a CSS injector isn't allowed! (It's a viable idea, but I'd previously considered it.)