I applaud this effort from the sense that generated book covers all seem to be so ugly and undesigned. There's nothing wrong with a generic, but well designed book cover. I mean, how many virtually identical hardbound books are there sitting on people's bookshelves...and they look beautiful instead of ugly.

http://bibliotique.net/images/080511-aa-1.jpg

http://www.dargate.com/cat/248_auction/248_images/1722.jpg

The difference is that there is some sense of trying to make them at least a little eye pleasing. Decent fonts, some pretty gold leaf designs.

This is not good enough http://i.imgur.com/YqjnSsF.png

Some kind of more clever generative art I think is called for. It should even have some kind of sensible themeing, like all books from the same author look kind of alike or something.

http://graywolfseo.com/wp-content/uploads/library-shelf.jpg

I'm not sure I like how the examples provided here look especially, but I think the idea is a good one.