Hello, Stumbled across here from a coder site and thought i'd throw in my two cents!

Personally, unifying all members of a team into one resource pool would be a good start, alongside showing how frequently the project is updated as to avoid wasting time with dead ideas. You could have two different page types - One to display the game to the 'outside' world, and one for wandering artists on the site looking to contribute to a project. Outlining each media file into a giant mosaic would allow people to get an overall feel for the aesthetical direction of the game, and perhaps allow coders/other project members to post a 'We need this!' in the project in hopes to attract attention to fill the need.