Zukiwi is a Gnome Shell and GTK theme that currently supports Gnome Shell 3.14 and the latest version of GTK.
Ranked in these QuestionsQuestion Ranking
Pro Offers PPA for easy install on Ubuntu based distros
Zukiwi offers an Ubuntu PPA for Ubuntu based distros.
sudo add-apt-repository ppa:noobslab/themes
sudo apt-get update
sudo apt-get install zukiwi
Pro Has matching GTK theme
Zukitwo Gnome Shell theme offers a matching GTK theme.
Con Only supports latest release of Gnome Shell and GTK
Zukiwi only supports the latest release of Gnome Shell and GTK.