One of my very favorite writers of adult fiction--T.C. Boyle. I recently read his newest, The Harder They Come (and as usual with his work, Very Dark Stuff Happens). I love this cover with its contrast between black and white and for how it hints obliquely at plot elements (the poppies, the evergreens, and the more jungly leaves).
One of my other favorites of his is Riven Rock, the story of real-life Stanley McCormick, his mental health battles, and his doomed marriage. Although I normally hate covers with real people on them, this one works for me, as the book is historical fiction and the shading and the real photo contribute a suitable moodiness and verisimilitude.
I am glad I ignored the cover, as it's smart historical fiction that feels timeless, with an unusual heroine and a compelling plot. I love the simplicity of this alternate cover--black and white with just that little hint of danger with the colored petal.
Here are some other recent books with both covers I love, as well as stories I will definitely re-read. My favorite colors are blues and greens, so it's a bit of a surprise to scroll through my book covers and see how many spare and clean black and white ones appeal to me.