I think Ultimate Edition should ditch GDM for MDM. Being an active member of Mint forum, I have been following closely the development of new MDM themes and I found some of them very interesting if adapted to Ultimate Edition and I want to share them with you. complete story at http://forums.linuxmint.com/viewtopic.php?f=25&t=126979
BTW these are animated themes I can't wait to see Ultimate Edition themes. It's the best in theming