So my coloured folders was initially achievable through CSS, but a change to the Obsidian code broke it. A request to the devs and a few updates later, it’s fixed again, although works in a slightly different (potentially better depending on your use case) way. I’ll update the CSS and post it if anyone is interested, but it will allow you to color any folder based on its contents. That makes it super flexible, but will still require a CSS snippet that you adapt to your specific use case.
I’m in the process of recovering from some hardware failure on my computer, but should be back up and running this weekend. I’ll keep you posted.