How about creating a materials repository website?
I’m thinking something where anyone could download a standard .blend file, change the material of an object in that blend for the one (s)he’s created, and then send it back to the server to share it with the world.
This site could also allow the users to make the quality control, voting on the quality, reporting if it’s not on the right category or if it simply sucks.
This came to my mind after seeing a lot of post asking “how did you make that material?”, and since blender doesn’t come with a materials library, this could become the next great thing for the blender community.
Regards from a guy who’s sad for not being able to use blender as much as he wants.