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oh yeah, now I see what you mean. Yeah I think that would be pretty good :) Perhaps for ease of implementation, a simple tooltip showing the quantity upvotes and downvotes they've made on that image, but I like the idea
I got a bit excited and came up with a more complete list:

Newbie - Uploaded your first image to imgur
Collector - Uploaded ten images to imgur
Major Contributor - Uploaded fifty images to imgur
Scrapbook - Created your first gallery and filled it with at least five images
Librarian - Created ten galleries and filled them with at least five images each
Whack-a-Mole - Downvoted ten 1 vote posts to 0
Whack-a-Mole Champion - Downvoted fifty 1 vote posts to 0
Whack-a-Mole Master - Downvoted a hundred 1 vote posts to 0
Butterfly Effect - Upvoted a 0 vote post to 1, which then went on to a total rating of over 1000 upvotes
Curator - Upvoted a hundred images
Philanthropist - Upvoted a hundred comments
Downvote Fairy - Downvoted a hundred comments
Forever Alone - Maintained negative reputation for a week
Good Guy Greg - Upvoted ten comments on an image you commented on that all had more votes than your comment
Public Enemy - You were downvoted by the same user ten times
Needle in a Haystack - Upvoted a top comment that already had over a thousand upvotes
I've been thinking about something like this for a while too, but I'm not sure revealing your identity would be such a great move. I think it would be quite easy to make someone 'hate' you if you downvote them (legitimately or not) a couple of times, and they could just create an alternative account and attack your rep with it as 'revenge'. I for one never write comments that I think are bad or overly insulting, and I think it would be hard for me not to feel just a little animosity towards someone who downvoted my comment once that person was identified to me.