I've installed MATE/MintMenu on my Ubuntu 12.04LTS Installation:
I've changed the theme to Ambiance, in an attempt to make it look like this screenshot:
I can't get my panels dark like the one in that screenshot. Any help?
This may occur because MATE does not use all of the GNOME libraries so may not register somethings and therefore they are left out.
You can try install this theme: