I know customization comes after functionality on the priority list, but I would love a few color options in the Appearance settings to replace the blue. Purple, orange, and turquoise would be at the top of my list.
I prefer a dark background anyway, so the background would be less of a worry, but a graphite grey and beige would be nice eventually too.
Also a way to access the blacklist of blocked users and communities so you can easily transfer them to accounts on other instances. It’s annoying enough to have 4 other instances’ versions of c/196 show up in my feed after I block one of them, just imagine having to go through that all over again on other accounts.