The Backdrop CMS community has been talking about better ways to showcase and try out contributed themes for a long time. As part of these discussions, I've created a website that uses the theme switcher module and allows users to try out a variety of contributed themes with some (relatively uncurated) demo content. I think the site is still crude, but useful. 

http://themeswitcher.simplo.site

I'm sharing it here for folks to use it as they like. 

  1. Please, let me know how this might be more useful?
  2. Are there contrib themes that I should add to this site? 

This site is making use of this module to switch themes: https://github.com/backdrop-contrib/switchtheme