Most of us are trying to find out how to make groups in this forum. I have an idea. Maybe some of you thought that already but i'd like to share with you.
It includes only admins and moderators..Actually it's an simple way. You will just change the "rank images" of admins and moderators at that path:
"..template(your template)imagesenglishranks"
Here's the result:

with some work, i've modified the group images of bestofjoomla.com for my native language..
It's up to your dreampower.. You can make great works..

(Note: If anyone wants me to make these images in his/her language i can do it for him/her )