I moved my Pictures and Music folders off my boot drive (now SSD) and onto my second larger drive. Creating shortcuts to these new locations in the sidebar creates standard folder icons rather than the original special ones (eg musical note for Music). So it seems that Mavericks only creates the 'special' icons if it recognises those folders in the Home folder.
Is there a way to trick the OS into thinking these are the 'real' music and pictures folders, so it creates those picture icons again? I saw other answers talking about symlinks, but I haven't used symlinks here (I don't know how to do that). Maybe that is the way to go if it does create the result I am seeking?