As usual, Darren Shan always fascinates with his book covers. Honestly, my favorite covers are the covers of his "The City" trilogy!
Here they are:
Book 1: Procession of the Dead
Book 2: Hell's Horizon
Book 3: City of the Snakes
I like all of them, but I think "Procession of the Dead" has the best cover and also, the story is amazing. I don't recommend everyone to read these books because it contains adult content. If you're sure you can manage the adult content, then give it a go!