How can I create new icons for files or folders? I can add them to the icon theme, so that I can access them by saying iconname in a launcher or notification, but I don't know how to make them show up in nautilus. As an example, I want to set an icon for the Ubuntu One folder, like how Pictures and Documents and so on have specific icons.
I realize I could change it manually, but that's not what I'm looking for.
