What are we looking for?
Quality meshes, that are up to modern standards (not too low poly, but if possible with a lower poly version for iOS?)
Textures for the meshes, including normal and specular maps if appropriate
Supply any files with a clear license description that at allows redistribution alongside Ogre. (for example one of the CC-licenses)
Where do I start?
1) Let us know what you 'd like to contribute
2) start modeling,texturing,etc.

We are going to setup a repository to store the files, and for that we're interested in how many people are joining.
Is there a theme?
Yes, there is! Although any artwork is welcome, we were thinking it would be nice if we could have a sample with a theme. So for example a medieval town, or a pirate harbor, or both (a medieval pirate harbor). For a start, here's a concept art of mine:
Here is my start of the project