Different icon for opened folder

[tehweezil]

I was trying out Debian the other day and I noticed that when you open a folder, the icon for that folder changes. I checked to see if it was just my icon theme or if this doesn't work in Ubuntu. So far I haven't got it to work in Ubuntu, anyone know how to get this feature?

I attached a screenshot of a directory with an opened folder on it just in case I'm not being specific enough.

(sorry if I posted this in the wrong place or something, I'm new to the forum :P )

Thanks in advance! :D