Eddited was my first subreddit theme. I have a habit for trying to customize every thing that I use, and reddit was no exception. I built a minimal theme for one of my own small subreddits, and shared it with the community to mild success. A lot of people enjoyed the theme for its out-of-the-box customizations.
Since I used LESS to build the theme, I was able to build an in-browser compiler to change most of the design variables. Using Vue.js, I built a website that would update the variables and generate the LESS files on the fly.