Having enjoyed the fabulous Google Nexus 4 'bumper' case, I was seriously disappointed with the official Google Nexus 5 case when it launched. Where the 4's case was a edge frame allowing access to the phone, the 5's was a chunky thick inflexible rubber whch allowed zero access to the back of the phone.
Enter the dragon Spigen Ultra Hybrid case (http://www.spigen.co.uk/nexus-5-case-ultra-hybrid.html#.U5r_sJ1dUXE).
(http://www.spigen.co.uk/media/catalog/product/cache/1/image/1000x1000/9df78eab33525d08d6e5fb8d27136e95/n/5/n5_uh_red.jpg)
Ok, it's not as good as the 4's bumper, but it's much nicer than the official Nexus 5 case which has been consigned to the bin. So if you are looking for a decent-ish case for your 5, then buy it here:
dMw Amazon Store (http://www.deadmen.co.uk/forum/content.php?191-dmw-amazon-shop)