I know I have a case fetish..... I have the Google in granite, the Spigen Ultra Hybrid, Spigen Rugged Armor, the Ringke Fusion clear, and the SUPCASE Unicorn Beetle in clear.
I like the Spigen Ultra Hybrid the least - the entire glass back is exposed, not just where the camera and flash are.
The Ringke fusion clear shows off the whole phone the best, not a bad case.
The Google case is certainly nice. I like the micro fiber back, It's OK.
The Spigen Rugged Armor is a rocking case. Looks nice, good protection.
But..... I put the SUPCASE Unicorn Beetle on a month ago and haven't taken it off. The frosted back shows off the Nexus logo; it's got more style than the purely clear cases, and offers good protection.