I did an informal opinion survey on Facebook, and by at least two to one, my FB friends selected the following image for the cover of Aurora Redress. Actually, this isn't the exact same image I showed them. I lightened up the background some and redid the title.
Many thanks to Joy Wilcox for granting me permission to use her image of the leaping girl silhouette.
As a matter of interest (or not), I also used the following two photographs of mine to create this cover.