H2o Emeralds
H2O Emeralds is a GTK theme based on the H2O Emerald theme, where rather than being green and grey, everything is green.
Installation
Download the tarball (.tar.gz file)
In a terminal:
mkdir ${HOME}/.themes
mv H2O-gtk2-Emeralds.tar.gz ${HOME}/.themes
cd ${HOME}/.themes
tar xzvf H2O-gtk2-Emeralds.tar.gz