Possible Duplicate:
How can I create a new kind of emblem?
Is there a way to add custom emblems to folders in Nautilus?
The emblems like Music, documents and the check mark on the Ubuntu One folder are very nice and I would like to add a few custom ones. For example, Audiobook.
In Nautilus go to Edit > Backgrounds and Emblems > Emblems > Add a New Emblem, type a name and choose an icon:
Close the window, then find and right-click the folder you want to add the new emblem to, and choose Properties. In the Emblems tab and select your new emblem:
