This post from the Quo Vadis Blog really caught my eye. They just teamed up with a company called Etchstar to create NotebookEngraver.com, where you can purchase artist-designed engraved notebooks, or you can create a design of your own.
As big as customization is these days, I think this is a really neat idea. I'll have to see if my wife wants to buy me this one. :)
Please be sure to let me know if you give them a try.