i added 2 more themes to the existing ones - the new ones are in beta mode and thus will be subject to more tweaks and changes. the new light theme is Beta-1 Light and a Beta-1 Dark is the dark one.
they aren’t much different than the other ones. but the most significant difference you’ll notice is that instead of the author avatar column in topic lists, you will see a posters column with the smaller avatars. there is a logic to their order - the author is the first one (beginning on the left), the next ones are frequent posters, and the last one is the last poster. if the last poster is the same as the topic author, then that one (last poster) won’t be shown.
you can switch between themes with the selector at the bottom of the sidebar here:
i forgot to mention that on mobile, the views are generally the same as the Basic Light/Dark but instead of the topic author, the avatar is the last poster.