The same gesture that you do to get to Google Now can be changed to turning the device/screen off.
Just install this free app called "Screen Off And Lock": https://play.google.com/store/apps/details?id=com.katecca.screenofflock&hl=en
I decided to call Google Tech support for the answer to ask whether the ear piece buzzing is causing battery drain. That's my only concern. I don't care if there's a buzz (the iPhone 4S had it, as did the GN, as do a few other phones).
I'm noticing how fast it discharges, too, AM I RITE?!! :laugh:
Using the new Lens Blur feature.
Just ordered this off Etsy: