Google has added a new official accessory for Nexus 7 (2013) tablet in
Google Play Description:
The premium folio features an open back bumper-style case with a trifold cover. It is made from a combination of durable polycarbonate and a soft elastomer to provide a perfect fit and a secure hold. The trifold cover gives two comfortable angles for upright viewing and ergonomic typing. With the convenient wake-up feature, Nexus 7 wakes and sleeps when you open and close the cover. For quick convenience, the Nexus 7 Folio works seamlessly with wireless chargers so you can charge and go.
Nexus 7 Folio is available in Black and Bright Red colour options and can now be purchased from Google Play in US. Other markets are expected to get it soon.