This is my proposal:
http://commons.wikimedia.org/wiki/File:Wikidata_logo_proposal.svg, which is
closely related to Wikimedia Commons' logo.
In Commons the red dot (the project) is receiving media files from the
different entities surrounding it. I think that we should maintain somehow
the same concept: the red dot (the project, the repository) provides data
to the circumference (which I understand is a metaphor of "everyone").
Hope you like it.
Regards,
--
Patricio Molina
http://twitter.com/patriciomolina