aospUI BlueGray, Substratum Dark theme +Synergy

AospUI BlueGray is the first and most strongly AOSP user interface inspired dark theme, it's "the old" DarkStockTheme. If you like dark themes and you love Google's Android design, this merges the two ideas together. The theme installs through an app that this app will link you to, where you will have to buy an add-on made by Substratum developers).