Hi all, maker here. This was a fun weekend project to scratch my own itch. Feel free to use, share and contribute. I'd be happy to answer your questions.
@mgrouchy I sure do. Most of the project is Middleman boilerplate and the list of themes are stored in a single YAML file. Feel free to add themes and/or make improvements.
Slack Themes
Pagecloud
Slack Themes
Product Hunt
Lion Accountability Browser
Slack Themes