You may saw Aurora theme we shared previously which was purely designed to use in Gnome desktop environment and isn't compatible with other desktops. bolimage from gnome-look made this theme compatible with Unity desktop and named it "Next Aurora" which can be used in Ubuntu 15.10 Wily and Ubuntu 15.04 Vivid. Next Aurora theme is kind of grayish color theme and it has one GTK version which is complete gray, this theme is also compatible with Gnome and other desktops. If you are using Gnome Shell or Cinnamon desktop then you should install original Aurora theme. You can use Unity Tweak Tool, Gnome-tweak-tool or Ubuntu-Tweak to change icons.
To install Next Aurora in Ubuntu 15.10 Wily/15.04 Vivid/other related Ubuntu based distributions open Terminal and copy the following commands in the Terminal:
Did you liked this theme?