I can't simply stop at 10 books, because there are way too many brilliant cover designs to choose from. Instead, here is a list of my favourite 20 in absolutely no order. They all pretty much peak for themselves in terms of how they're awesome, but if you disagree or think I've missed something out, don' hesitate to comment!
Angelfall - Susan Ee --- Cress - Marissa Meyer --- Wither - Lauren Destefano
Rivers of London - Ben Aaronovitch --- Cloud Atlas - David Mitchell --- Sweetly - Jackson Pearce
The Book of Lost Things - John Connolly --- Enchanted - Alethea Kontis --- Coral and Bone - Tiffany Daune
The Night Circus - Erin Morgenstern --- Some Quiet Place - Kelsey Sutton --- Dance of Shadows - Yelena Black
Gospel of Loki - Joanne Harris --- Matched - Ally Condie --- These Broken Stars - Amie Kaufman and Meagan Spooner
Splintered/Unhinged - A.G. Howard