Back in the days of yore, there was one thing I enjoyed about LJ. and that was mood themes!! I also liked the multiple icon choices as well (paid accounts got you more~), but that isn't the post.
I know there's a script floating around for this, but it's...clunky. Copying and pasting a massive code dump just to use an old LJ mood theme? I'll do it, but I end up forgetting more often than not.
Having the ability to create them in future and have the little menu to find a mood? Would be A+!!
Obviously, this is just a complete wish thing and it would be a very low priority thing, but if it's even considered? Awesome!!
One more image to show what that mood thingy looks like in a post on LJ. I went back to that horrible site just take a desktop example image. :V
It's sort of like how in Discord people can add emoji responses to your post, except in this case YOU are adding the emoji to your own post.