I noticed the Mint 14 Mate edition did not have anything but a default pixmap for the face browser in the MDM themes. I went in to my Cinnamon desktop and copied the contents of /user/share/pixmaps/faces, ran gksu caja and copied the pixmaps over to my Mate install. Now I have all of the nice pixmaps to use in the face browser.
I did things simple. I copied the faces folder, compressed it and e-mailed it to my laptop with Mate. Quick and easy!