Dark Material is available with over 80 themed apps and tons of system modifications. It offers you a flat and well-designed interface with many rounded icons. Allows you to choose the accent color. In some parts of the interface, it even has a super cool background design. It is also compatible with a lot of third party applications. It will work in Nougat, Oreo and Pie. This theme is based on Pixel and Aosp Rom. Contact me before posting bad reviews or comments. We can both personally improve things, trust me.
Required Android Versions : Nougat [7.0 – 7.1.1] - Oreo [8.0-8.1]