I want to make a mochi theme, but don't know where to start. I saw the everforest theme someone posted but wanted to change the colors to make it revolved around purple. Any help would be great! Thank you!

I would start from using a developer tool (ctrl + shift + I) to inspect class names and make CSS file on my own😅

For example, the main background color is from this CSS variable var(--mochi--side-bar--background)

We can upload our CSS to overwrite these values.

Are you looking to theme the content of cards or the app itself? If the former, here's an example of a simple theme I created for myself https://github.com/brunomorency/mochi-remarks/tree/main