It seems that Mac design is inspiring many artists that try to provide the best optical alternatives on Gnome Shell. Lately, I’ve seen many Mac-like themes poping out, but Zukitwo Cupertino is one of the best.
As the name suggests, this theme is based on Zukitwo and is made to blend well with Mac OS GTK themes like the Adwaita Cupertino. Zukitwo Cupertino is compatible with both 3.4 and 3.6 version of Gnome Shell.
The theme’s elements follow the common Mac design logic (switches, buttons, light blue color) and everything looks as clear and as shiny as you’d expect.
For Gnome Shell 3.4, you should download version 0.5, and 0.5.1 for GS 3.6. As this is the first version that works for 3.6, it is natural that it isn’t very much tested yet, but the 0.5 version for GS 3.4 is mostly debugged.