freedesktop - Jan 2012 - [fdo] Create a freedesktop directory my own personal way

Let's say I'd like to create a directory for urgent stuff I need to deal
with. I'd put this line on ~/.config/user-dirs.dirs:

XDGURGENTDIR=?\$HOME/Urgent?

Right?

But now, how do I assign a custom icon to it?
I know I can just change the icon for any folder or file under 
properties, but that's not what I want! I'd like to do it "the
right way".

Using gnome, by the way.

Sorry if this is not the place to ask for this kind of help. Noob here!