One of the most popular Roms for Nexus devices is the CleanRom series by Scott of ScottsRoms. This series is dedicated to bringing the full stock experience with added performance, slight debloating where necessary, added stability, battery life, and functionality all without all of the often unnecessary length of extras that can bog down custom roms.
CleanRom 1.5.0 is the most stable build for the Nexus 6 yet. It is based on Android 5.0.1, and has SuperSu preloaded. The Aroma installer is included which means you will be able to chose which apps and extras you would like to keep and takeaway so you can make this rom your very own. In the Aroma installer choose your carrier (rom supports multiple carriers), choose your launcher (Nova, Apex, Stock), choose your Google Apps (Gmail, Youtube, Hangouts, Maps, PlusOne and Photos, Movies and Tv, Music), Misc apps (Clear All Recents App Mod, ES File Explorer, Reboot Menu, AOSP Gallery, AOSP Music). Other features include Free wifi tether mod for AT&T, FS Trim, Init.d support, and more! Head to the link below for the download.
via ScottsRoms