UPDATE: now works on both top and bottom panels
by popular demand here is mintLeaf-AV (alternate version)
mintLeaf-AV Cinnamon theme. The perfect theme if you are a fan of Linux Mint
* smooth dark separating panel with no green border.
* smooth dark leaf like shaped menus.
* hovering popup menus with a drop shadow for added depth.
* mint shaped buttons.
* metal green switches.
* Linux Mint logo ripple
you'll like it.
To install a theme: Download it and decompress it in ~/.themes (or /usr/share/themes to install it system-wide).