Since some users have so much reputation and have done so much for helping other on Stack Overflow, how about having badges named after them?
Jon Skeet Gold badge
for having 50 Gold badges
Jon Skeet silver badge
for having 500 silver badges
Jon Skeet bronze badge
for having 500 bronze badges
Marc Gravell badge
for having more than 300 upvotes on an answer
Since it will be very difficult for obtaining such a high number of badges, they will be, can we can say, prestigious. In a way this will honour the users after whom the badges are named.
Or finally maybe we can have a Stack Overflow "hall of fame" for really great users on Stack Overflow.