Member group colors legend in "Who's online"

[Burpee]

Hmm.. think the title pretty much explains it

I saw this on a site a while ago and thought it was a pretty good idea. TheBurglar then copied the idea from my site to his site.
(My fellow admins on my site told me to take mine off because they're afraid people are going to post to get better colors...)

I believe this is easy and should definitely be a option in the theme settings.