Pixel – Android O Dark Substratum Theme [+Legacy] v277 [Patc…
Pixel – Android O Dark Substratum Theme [+Legacy] v277 [Patched] APK [Latest]
Pixel – Android O Dark Substratum Theme [+Legacy]
You can also try: CM Launcher 3D-Theme Wallpaper v5.55.5 [Pro] [PROPER]
This theme is exactly the one that Google put in Android M second preview and N, extended on more apps.
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Pixel-Android O Dark Substratum Theme [+Legacy] v277 [Patched] APK / Mirror