Radius – CM13/12 Theme v2.0.3Requirements: 5.0+Overview: You can choose from a selection of different theme variants, styled light or dark or with a different color.

Download the Arcus App from the Playstore to build those custom theme versions on your device.

You need a rom... http://www.apkformod.com/radius-cm1312-theme-v2-0-3/