Currently there is, to me anyway, very little to no documenation on how to access hosted wallpaper files using an xml file.  The setup/advanced/extension downloader/additional repositories usage is cryptic and seems unrelated to wallpapers (if you are starting from just wanting to use additional wallpapers, that is).

With the fab's larger screen I would expect many more people to want to access more wallpaper choices than with the controller.

I'm not sure that the "component" of "setup" is correct, but there isn't a documentation category.

Also, it may be nice to have a software enhancement to make it a bit more straightforward, too.  Perhaps adding it to the "customize controller" screen that has to change, anyway to better handle/refer to the fab.