Gwenn is a Breton word (a language spoken in Brittany, the French region which I come from) which means 'White', 'Happy' and 'Sweet'.
This theme is a very light and simple v-runner theme which is meant to perfectly fit with the GTK theme. I personaly use it with a slightly modified version of KDEOxygen new port by kimmik
For the themes to fit, you GTK background must be #E8E8E8 (or RGB 232/232/232)
The screenshot is a no-button version (I am using keyboard shortcuts instead), however, by default, the theme has some.
Buttons are a colored version of those from metak's Choco
Extract the archive anywhere, then Click 'Import' in emerald themer and browse to Gwenn.emerald
Open the README file for further information.