Site themes, along with Dark Mode, is on the long-term to-do list. There are some technical hurdles I have to jump over, first.
Coming in the next release.
In the works.
As Thorvald has said, there's a link to your friends list in the Account Summary section. The heading "Friends" links to it. But, not having a link to it on the Friends Feed was an oversight on my part. That will be remedied soon.
Fun fact, the messaging system was one of the first things I built for the site that wasn't a direct part of the user account system. It's due for a bit of an overhaul. I'll see what I can do to tweak it out.
Lit and audio pieces are shown with the rest of the images. But, Thorvald is right; they're few and far between right now, so they are easy to overlook, even with the ribbons. In the works is a system to filter the Recent Uploads page by upload type (image, audio, literature). That should help make them more findable. Maybe I can split out upload types into separate blocks on the main page.
Hm. Well, chickensmoothie.com, for whom ChickenPaint (our oekaki software) was originally developed, has a great tutorial here. I'm considering writing them to see if I can copy their guide, with proper credit and attribution.
Hope this helps!
-- BK