Gnome-Pro, a new GTK+ theme made by paulxfce, is a great theme for Gnome 3 Desktop with GTK > = 3.20.
A clear and easy-on-the-eyes theme that is meant for those who use the Gnome-desktop professionally on a daily basis. The focus in this theme is compatibility: GTK-2 applications and GTK-3 applications look virtually the same. Libre-office, Scribus, Evolution, Geary, Planner, GnuCash, LaTeXila, Geany, the Gimp, Inkscape,…
Chrome, firefox, Web and Opera have no issues with this theme.
About the looks, you will notice some Elementary-theme, Arc-theme and Gnome-OSX.
Sphere is a beautiful icon set for Gnome3. It is based on icons by D.Arneaz, who has some great arts but only for Windows. Install this tutorial I’ll show you how to install this icon theme on Ubuntu 13.10 Saucy Unity.
Download and apply Sphere icons on Ubuntu 13.10
To get started, click below link to download the icons with all colors: