So this is kinda interesting. Douglas Coupland's latest novel, Generation A, has just been published in hardcover (on the left above).
You purchase the book, and it is delivered with a code that you punch in on the site. You can then create your own cover, adding in your own personal text (within certain character limits), and choose from a palette of colours for the text and background colours on the cover, spine and flaps. Here's a few examples from the gallery on the site:
You can't track the letterspacing, so it's fairly klanky, but it still leaves you a fair number of options to play around with.
(Rather clumsily, the link on the site to the standard hardback version currently leads to the paperback version instead - so here's the right link to the standard hardback of Generation A.)