Tyler's Community is a Garry's Mod server network, which I've started doing sysadmin/web dev for recently. Here's the persona/lavender mix I've made for their nodebb instance.
Probably won't ever be released for use by other forums since there's a lot of hacky stuff (i.e. login page totally removed and replaced with steam sign on) and things thrown into the custom css in admin panel as well as it running a major version old nodebb for compatibility with Steam SSO.
Thanks for the idea of using :before for category headers, CryptoFR