Wall Art is often available on the Bethesda Gear Store, including lithographs of key art or concept art. Some third party companies also have the rights to sell official art as prints.
DisplateEdit
There is an official Elder Scrolls collection on Displate, an online retailer that sells metal prints. Their lineup includes concept art from Skyrim and ESO, key art from ESO and Skyrim, and Legends avatar and card art. The official Elder Scrolls brand collection can be found here on Displate.com.
Cook and BeckerEdit
An official Elder Scrolls Online collection is available at Cook and Becker, a website that sells officially licensed prints of video game concept art. The Cook and Becker Elder Scrolls Online Print Collection can be found here on CookandBecker.com.