Take a look at https://riben.talk/ for example. (Credits @kddkd)
You could also get in touch with it at https://discourse.theme-creator.io with minimal limitations (positioning the search field in the middle of the header, I would recommend)
PS! After applying the new theme, don’t forget to refresh the website in your browser.
Update: @Heliosurge screenshots are now in the first post, thanks for the nudge! Let me know what you think if you give it a try.