if I could design my own covers
...I might do something like this for Queen of Swords (click for a larger image).
The painting is "Wheel of Fortune" by Sir Edward Coley Burne-Jones. This is a detail from the painting, leaving away the naked men off to the right: a king, a poet, a slave, all of whom are waiting for Dame Fortune to spin the wheel.
I like this painting for its colors (although it's not my usual taste) and for the composition. It also resonates for me in terms of the story I'm telling. Whether the Queen of Swords is Hannah or Jennet or somebody else, and if the Queen of Swords is connected to Dame Fortune -- those are things that will make themselves clear by the time I'm done.
Of course, all of this is moot, as I don't design my own covers, and if history repeats itself, I won't be able to keep this title, either.