I just used SVG of original lemmy logo, but I think I can try to design custom logo for Jerboa as well, will give it a thought.

Yep, I don’t think you can do it in any of the stock ones. I’m using Nova in case you are interested, really cool and configurable launcher

Different colors as well, in case you would like to use it. edit: changed link to the archive with original files, not compressed imgur.