Something I enjoy as I mentioned in another thread is generating cover art. Perhaps a dystopian background, a little cheesecake, some ominous font and viola. Though I'm sure that good cover art will sell a book as quick as a solid description, I still have to say I'm struck by the blunt simplicity of older hardcovers before much in the way of art is added to them.
Lean, simple; a good font, just the tiniest amount of styling... Title and the author, the end.
Unlike typical SF covers, 'to me' it speaks of something possibly wonderful inside. As though the moment you open the sedate cover, bright light will spill out and a world of wonder pour forth. Here's a good example of what I'm saying:
A few others of ERB: A Princess of Mars
So what are your thoughts? Are we so fixed on typical advertising that we have perhaps forgotten the artistry of the tease?
K2