I've been to forums like that, and I thought it was pretty cool.
But I'm not sure how well that would go with this forum's cleanliness (is that a word? haha). You know we like to keep it simple here. I think people could easily overdose on these special features and we'd be seeing yellow flashing usernames in no time...
Also, the mods, admins and honorary members have special colors for their names - this could also be a problem. You wouldn't recognize as easily who is a mod and who is not (if anyone even pays attention to username color).
But I guess there are also other things to "win" except for username modification...