Nord is a new glassy GNOME Shell theme based on Zukitwo, created by WebUpd8 reader rAX.
The theme is currently in beta and there are some known bugs but it already looks great, featuring some unique elements like the switches which look amazing (see the screenshots). If you use GNOME Shell, you must really give it a try!
Here are a few screenshots:
To use Nord, either extract it in the ~/.themes/ folder and use GNOME Tweak Tool or ThemeSelector GNOME Shell extension to apply the theme or rename the extracted folder from "gnome-shell" to "theme" and replace the /usr/share/gnome-shell/theme folder.
Download Nord GNOME Shell theme