I'm deciding between a couple of things at the moment....thinking somewhere between a picture of the Academy grounds...or the Semezou warehouse...or a group portrait....running a contest now to choose the cover artist
I'm leaning more toward dramatic poses, landscape and abstractions (circles and/or fluctuating energies) than a distinct scene though
the tagline my prereaders and I stumbled on is "Evolution can be inconvenient" because it more or less summarizes a lot of the story as a whole
If you are leaning toward the abstractions/fluctuating energies side of things, i highly recommend you take a look around
http://electricsheep.org, a site that runs a distributed network (one of those screen saver computational deal, like LHC@Home, etc). Its all about creating and breeding large Fractal art in such a way that they literally evolve. Quite interesting, usually stunningly beautiful, and they have a rather simple policy regarding reuse.