Use APKPure App
Get Gemini (CM12/CM13 Theme) old version APK for Android
Dark and Blue Theme for the CM12 Theme engine (and other roms using it)
PLEASE KEEP IN MIND THE THEME ENGINE HAS BUGS AND LIMITATIONS
Some devices have issues with the SystemUI not changing
this is a bug with the Theme engine not with the theme
The theme colors the following apks
-Calculator
-Settings
-SystemUI
-Wallpapers
-Analog Clock
-CM updater
And More to come