I have a simple taste. I like the graphic covers, with the name of the book, the author and perhaps a picture.
Pauline Baynes, especially her black-and-white illustrations. May she rest in peace :-)
Her miniatures are absolutely amazing... I wish I had the patience and endurance to keep working with my miniatures, so that one day I might be as good as she was :-)
Added a little later:
I would very much like covers like these for my books:
These are inspired by Swedish John Eyre,
who made the covers for the Swedish prints of Dan Brown's books,
and something similar to this for the Finnish author, Väinö Linna.
I don't like the colors, nor the daisies, but the idea made me cry.
Thank you, John, for understanding the Finnish folk soul and Väinö Linna :´)
P.S. I found this about the Outlander covers. Oh, how I wish they had stayed with this cover! I would never have thought it was something for me... :-( I hate the book. :-D
P.P.S. These are the covers for my NaNoWriMo, designed by yours truly. :-)