Joy Theme Creator
I recently played around with Joy UI, the new UI library by the MUI team, but less Google-esque and opinionated.
The library is still in alpha stage but it’s looking very promising.
Inspired by a theme creator for MUI, I created a web app that exposes the theme customisation options available. It does this by providing colour and typography picker controls that gives a live preview and theme config options you can copy into your own project. Check it out here: https://oliverbenns.github.io/joy-theme-creator.