Suggestion: display the avatars at a much lower size (24px or 32px max) and add 'overflow: hidden' to the usernames, along with a fixed with to avoid usernames/stats from getting pushed down below the avatar.
Overall, I just think this should be a lot more subtle and minimalist… :) An option for a light version (light grey background) would be a welcome addition.
PS: I'm gonna be doing this myself for my own needs. If you'd like, I can fork and send you a push request. Let me know your thoughts! :)
Cheers,
-LF