At Book Cover Nouveau, you e-book authors can find some ready made artwork for your covers.
At least that’s the advertising pitch.
I suggest it could be used as a revival of an old pulp magazine tradition: writing a story to match a cover. Robert Silverberg used to do that. In his pre-Scientology days, L. Ron Hubbard used to be a fast enough writer where editors would send a messenger over to Hubbard with a cover and wait while he banged out a matching story.
They are some handsome covers.