Yeah I’ve been thinking about this a lot lately. Group UI/UX definitely feels like an outlier to much of the app. Something like custom user fields but for groups could be really useful.
The fact that the main group listing scrubs HTML in the description makes it hard to add additional items to use for CSS styles, too.
In the main groups listing I needed to show some “tags” for the various groups so I resorted to renaming them to sort the “groups of groups” how I wanted, and using some CSS hacks on the ‘href’ selector to add some content with a little color label so people can easily tell the types of groups apart.