This theme is exactly the one that Google put in Android N preview, extended on more appsm and with Pixel accent color.

CyanogenMod/CyanogenOS ROM is needed (ROM means system). If you don't have it, do not buy the theme.
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

For any problem or suggestion, send me e-mail at piereligio@gmail.com
or join my G+ community https://goo.gl/mqrm9u

Themed elements:
-AccuWeather's dark widget
-Alarm tone
-Bootanimation
-Font
-Notifications
-Ringtones
-System UI
-Wallpaper

-Browser
-Calculator
-Contacts
-CyanogenMod File Manager
-CyanogenMod Messages
-CyanogenMod Recorder
-CyanogenMod Updater
-Dialer
-Documents/Download UI
-ES File Explorer
-Framework-Res
-Google Calendar
-Google Chrome
-Google Dialer
-Google Drive
-Google Keep
-Google Hangouts
-Google Inbox
-Google Launcher/Now
-Google Mail
-Google Messenger
-Google Play Music
-Google Play Store
-Google Plus
-Google Translate
-Instagram
-Kernel Adiutor's dark mode
-Launcher3/Trebuchet(=CM Launcher)
-N style notifications
-Nova Launcher's searchbar
-Package Installer
-Root Explorer dark theme
-Settings
-Solid Explorer dark mode
-SoundRecorder
-SuperSU
-Telegram (only partially themed. For full theme use Plus Messenger, a Telegram client, and download this and apply it from personalisation settings: goo.gl/VPvSVO )
-Theme Chooser
-Twitter Night Mode
-YouTube (settings and few icons)
-WhatsApp

Thank you all for supporting me. :)