I enjoyed Erin Morgenstern's The Night Circus and the cover (both UK and US ) fit the whimsical theme and feel of the novel.
The Artist : Helen Musselwhite
Musselwhite, isn't your typical artist, her medium isn't paint and paper. . .it's just paper.Believer it or not but her paper creations are handmade in her U.K studio.
Here are a few of my favorites, her designs are simple and clean. All of her work seems to fit the fantastical themes in The Night Circus.
Here are some examples of her paper artwork
Musselwhite also produced this early version of the cover that was posted on Morgenstern's website.