The theme is open sourced and lives in this repo. We're planning to add more themes soon and hopefully a few other cool features like user flairs. If you want to assist improving them, feel free to send PRs or ideas.
I like the old designs better for many things, no need material design or the new whatever crap, and don't change the menus around too much please, I don't want to work to find out how to use the apps or websites.
The apps or websites should work for me, not the other way around.
So I'm here to complain (/s), this new theme you added totally rocks! Good job @db0@lemmy.dbzer0.com!