Every six months or so, NewCon Press publishes four SFF novellas around a particular theme. The publisher then commissions a single piece of artwork that expresses an element of each story in a single panel or image. The panels are then lettered and branded to create covers, and the four books are sold as a box set with the original single artwork as a wraparound.

NewCon Press is always interesting, and Jim Burns has been one of my favourite artists since I was at school. The Martian Quartet is a great example of this innovative approach to publishing and depicting short science fiction books:

NewCon Press site

Jim Burns site