A suggestion:
Even though there are winners for Avatars, my suggestion was the possibility of selecting a set of avatars that can be assigned to several users.
Some campaigns have done this, and it could be something interesting. Here's the suggestion.
This is a good idea.
To have one avatar for each signature participant is very nice.
Sinbad now has several similar avatars. Many of the finalists look very similar, and everyone could use a different one.