Dark Material OOS is out with over 80+ themed apps and a ton of system modifications. It gets you flat and nicely designed Interface with lots of rounded icons. It lets you choose the accent color. In some parts of the interface, it even has a super cool background design. It also supports a bunch of third-party application.

Supported Devices on Stable Stock OREO or Pie ROM are :-
- Oneplus 3
- Oneplus 3T
- Oneplus 5
- Oneplus 5T
- Oneplus 6
- Oneplus 6T
- Oneplus 7
- Oneplus 7 Pro

You must be on Stock OOS and have Substratum(get it here: https://play.google.com/store/apps/details?id=projekt.substratum).
or
Substratum Lite(get it here: https://play.google.com/store/apps/details?id=projekt.substratum.lite) installed.

Support group for any queries and app requests :-
https://t.me/joinchat/ADq1_UPUuzDCTXogRGvA6Q

OPTIONS WITHIN THE THEME:
49+ Accents
10+ Backgrounds

INSTALLATION INSTRUCTIONS:

1 - Download and Open the Theme
2 - Open Substratum app
3 - Click on Dark Material OOS
4 - Inside Dark Material OOS you can click on the overlays that you would like to install (keep in mind that some apps, mainly Android system, have different variants to choose from)
5 - Click the floating button down the bottom and select Install
6 - Once that finishes compiling/installing with no errors, Restart your Device
7 - Enjoy :)

This Theme is Maintained by Vivek Modi.
Please contact me before posting bad reviews or comments. We both personally can make things better, Trust me.
Telegram :-
https://t.me/vivekmodi

Special Thanks to :-

Aditya Gupta : -https://t.me/Aditya_Gupta
Nicholas Chum :- https://t.me/nicholaschum
Fahad Javed :- https://t.me/fahadalijaved
Customworx :- https://t.me/customworx
Char_G :- https://t.me/Char_G
Moelle1 :- https://t.me/moelle1