So this is kinda interesting. Douglas Coupland's latest novel, Generation A, has just been published in hardcover (on the left above). 

Random House are also publishing a limited edition of 2000 signed slipcased versions (on the right, above), for which you can create your own personalised cover, via the Customized Coupland website. 

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.)