Have you considered offering free storage for freely licensed (cc-by & cc-by-sa) works?
I want to share my photos under a free license, but the one thing that always put me off Flickr was that I would have to pay an indefinite subscription to contribute to the commons.
I want to share my photos under a free license, but the one thing that always put me off Flickr was that I would have to pay an indefinite subscription to contribute to the commons.