2. Zuki Blues
4. Cadmium Suite
5. Mint Clearloox & Mint Elementary icons
Download (.deb): Mint Clearloox (now called Mint-X) | Mint Elementary icons (now called Mint-X icons)
This is a theme which was recently uploaded into the new Linux Mint Debian repositories and have not been released elsewhere. But you can install them in Debian / Ubuntu / Linux Mint (based on Ubuntu) using the .deb files above.
Some of these themes requires the Equinox and Murrine engines. Click for Equinox GTK2 Engine installation instructions.