I use Mint-X icons but I also like Faenza folders, so I use Mint-X-F icons. The only problem is that the Dropbox and Transmission icons in the tray are too dark and not like the monochrome icons. I also did not like the green battery icon. I have added nicer looking icons that complement the whole look.
Thanks to john007 for Mint-X-Faenza Folders (Mint-X-F) at http://gnome-look.org/content/show.php/Mint-X-Faenza+Folders+%28Mint-X-F%29?content=135238
The Mint Update icons can be found here --> http://gnome-look.org/content/show.php/Mintupdate+Icon+theme+7?content=151497