One of the most elegant themes just got reloaded for the latest 3.8 version of Gnome Shell! Viva theme is based upon the previous version (3.6) with no optical changes for the time being.
Viva looks fresher, leaner, cooler more elegant and more modern that the default Adwaita that was the basis for its creation and although it seems to never get completely finished, it does work like a charm since 3.6.
Since this is a work in progress, it is recommended that you use the latest version found on the corresponding git repository. It is also recommended that you use this theme with Raleway and Open Sans fonts.