The GBO Post Based Member Group Titles and colors are as follows:
Member 0-4 --- Members with under 5 posts are this color
Member 5-100 --- Members with over 5 posts but under 100 posts are this color
Avid Poster 101-250 --- Members with over 100 posts but under 250 posts are this color
Contributor 251-500 --- Members with over 250 posts but under 500 posts are this color
A Real Regular 501-100 --- Members with over 500 posts but under 1000 posts are this color
Senior Member over 1000 --- Members with over 1000 posts are this color
Other Non Post Based Member Groups that have assigned colors are:
Administrators are this color
Global Moderators are this color
Moderators are this color
GBO Supporters are this color
GBO Sponsors are this color
I just updated the colors today so this is the current layout.
Matt