Comment 17 for bug 437385

Sergio, It's not possible, regardless of whether it is worth doing or not. Moving the icons to a private directory is equivalent to not having the icons at all. Using the GNOME theme, there should be 2 emblems. (We install 2 emblems to hicolor from ubuntuone-client-gnome.) There is no API in Nautilus for telling it "I have new emblems available in this other private directory, you need to look here also." And if there were, the icons would presumably still show up in the emblems dialogs you're complaining about, as they are emblems. That is just how emblems work in Nautilus currently, which is broken, and why Nautilus itself must fixed. There's nothing we can do in ubuntuone-client, outside of just removing the icons, which is a detriment to the usability of Ubuntu One, since they are there to provide information to the user about the files, in Nautilus.