In this app you can find 3 different boot animations of android N and Android Nougat sounds and other in edited navbars. This Navbar Pack is based on Android N rumors. Let me know how it is.
Some roms have in Settings in the navbar section, an option that can colour your navbar in black and white. So if it is activated your navbar will be without colour. So disable this option, reboot and enjoy the navbar.
N Navbar Substratum v8.1 Apk