This is a strongly stock inspired dark theme, it's "the old" DarkStockTheme.
If you like dark themes but you don't want to lose stock appeal, this merges the two ideas together.
The theme installs through Substratum Theme Engine app, that you can download here, IT REQUIRES ROOT (except on OMS rootless and on Samsung Touchwiz Nougat system) and/or a Layers or Substratum compatible ROM: https://goo.gl/BB5eio
The theme has been tested on many ROMs, including stock Google and custom Marshmallow and Nougat ROMs (OxygenOS is supported too, it is Substratum Legacy though).
Android 6, 7.1, 7.1.1, 7.1.2 and Oreo (also with Andromeda rootless) are supported.
On 7.1-7.1.1 Substratum Legacy ROMs (including stock ones) you need to use an option called Frameworkless7.1RROcompatibility, and it has white notifications.
Sadly it isn't possible to make them dark on that option.
Some manufacturers' ROM's aren't guaranteed to be compatible (the farer they are from AOSP or Google ROMs, the more they're likely to not be compatible. In case you end in bootloop flash the rescue zip that you find in /sdcard/Substratum/ (the substratumLegacy one if your ROM is RRO. Only most custom ROMs have OMS, the rest has RRO) and ask for refund, also by e-mail if you need.
This is the icon pack that you can see in the first screenshot, that I personally made to fit dark themes properly: https://play.google.com/store/apps/details?id=com.piereligio.darkpixelip
-Pixel boot animation (on OMS only);
-Pixel and Nexus ringtones and UI sounds (on OMS only);
-14 accent colors (Pixel blue and Teal only, on FrameworkLess option);
-Android N-ify XPosed module;
-Car Throttle dark mode;
-ES File Explorer;
-Google Chrome Beta;
-Google Play Console;
-Google Play Music;
-Google Play Services;
-Google Play Store;
-Kernel Adiutor's dark mode;
-N style notifications;
-Root Explorer dark theme;
-Solid Explorer dark theme;
-Telegram (join the chat group of my themes and ask for the theme there to me);
-Twitter night mode;
Thank you all for supporting me. :)
Layers Substratum AOSP UI Dark Stock Theme OMS RRO theme stock Marshmallow Android 6 6.0
-Fixes in Gmail;
-Fix in SystemUI on Samsungs;
-Fix in Samsung Messages;
-Fix in Samsung Phone;
-Added an option in Android System overlay to let the apps choose their accent color for notifications also in Substratum ROMs.
-Fix in Google Chrome;
-Fix in SystemUI;
-Fix in Google Plus;
-Fix in Gmail;
-Fix in Samsung Contacts.
-Fix in Samsung Messages;
-Fix in LawnChair.
357: Hotfix in GMail.
-Fixes in Facebook Messenger;
-Fix in GMail.