The RimThemes Mod brings a themes engine for RimWorld. It modifies all game UI, making RimWorld look however you want. It’s fully customizable (custom fonts and many other things can be disabled in the mod settings!).
If you don’t like the default themes you can create your own! Learn how here.
RimThemes Mod Review
If you don’t like the default look of the RimWorld interface, or you simply want to customize it, the RimThemes Mod will allow you to do just that. Not only with the default themes it comes with, but also setting up a framework for other players to create their own themes!