This theme requires CM10/11 or an AOSP based ROM with Theme engine.
Its purpose is to enhance the Android UI without compromising the vanilla look.
NOT suitable for Lollipop!
The Dark version features the following inverted apps: Contacts, Messaging, Gmail, Email, Calendar, Google Now, Google Talk and Play Store.
HOW TO APPLY:
Install the app, go to settings/themes of your ROM, select system theme and REBOOT. After that apply this theme and reboot again.
If you get: "Sorry, this theme is missing assets for your device's screen size", APPLY IT ANYWAY.
Stock battery is available as "circle" in settings for AOKP/Liquid.
DARK GMAIL (just install - thanks to the Blacked Out Team)
Official thread @ XDA Developers: http://forum.xda-developers.com/showthread.php?t=1615767
For problems send me a mail - firstname.lastname@example.org