This is a rework of the Adwaita gnome shell theme with a more aggressive use of gradient and transparencies and a different base colour.
It looks quite good with this wallpaper by 0asa:
You can install it by using the Gnome Tweak Tool and the User Themes extension
I tested with gnome 3.12 and with a bunch of gnome shell extensions - feel free to send me any feedback on bugs, inconsistencies etc..
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