How to Theme Your Android Oreo Device with Substratum and Andromeda (No Root Required)

Android 8.0, affectionately and officially known as “Oreo,” changes a lot of things in Google’s mobile operating system. But the most obvious is a switch from a general dark theme in the interface to blinding white on the Quick Settings menu on the notification bar. If you’re tired of looking at all those fully-lit pixels on your phone, there’s a way to theme the interface with some new tools—no root required.
by Michael Crider via How-To Geek