The Casual Optimist has a round-up of the best book covers of 2015. Three of my favourites from the list below; make sure to check out the full 120 covers here.
Racism: A Critical Analysis by Mike Cole, design by Daniel Benneworth-Gray
Why Information Grows by Cesar Hidalgo, design by Richard Green
The Vegetarian by Han Kang, design by Tom Darracott