Update: Ambiance Blue Theme Suite has been released with support for GTK3.I personally like the blue color and the new light themes included in Maverick. So I've made a blue variant of the Ambiance theme. It has window buttons on right and uses Faenza as icon theme, but you can use any you want as I haven't included it as dependency.
I've also made a green variant especially for Linux Mint users to give your desktop a fresh minty look. It also has window buttons on right and uses Faenza-Mint as icon theme. To use the icon theme, you need to install both Faenza and Faenza-Mint icon themes.
Both themes are packaged into deb installers for easy installation. Note that you need to update your murrine engine if you want to use these themes in Ubuntu 10.04 Lucid or Linux Mint 9 Isadora.
To install latest Murrine Engine,, run the following in the terminal,
sudo add-apt-repository ppa:murrine-daily/ppa
sudo apt-get update && sudo apt-get install gtk2-engines-murrine
Bugs might be present as I don't have any knowledge regarding theme creation. Any suggestions for improvement will be appreciated.