The GNOME desktop is quite popular and gets a lot of themes, but Darkair 3.9.5 should provide its users with a little more class.
Most of the GNOME themes are not very good and it's very difficult to find anything that has the right amount of color and contrast.
This is where Darkair 3.9.5 comes into play. It's available on multiple platforms, such as Debian 7.0 with GNOME Shell 3.4, Fedora 19 with GNOME Shell 3.8.3, Ubuntu 13.04 with GNOME Shell 3.6, and even Ubuntu 13.10 (Saucy Salamander).
The latest version of Darkair is the first one to be released in both .deb and .rpm formats. The developer has fined-tuned the theme in order to make it work with older versions of GNOME Shell and it even comes with a Big Border variant.