Altered Books and Pop-up Sweaters

I find the idea of altered books scandalous and tempting. I cannot imagine finding a sweet old book and "altering" it, but I would love to fill an old book with pictures and charts and use it as a knitting journal. Right now I have three moleskins and a clipboard of magazine sheets and lots of paper bits. I've been looking through Paul Jackson's The Pop-Up Book for Christmas card ideas, but find myself thinking about pop-up knitting charts for sweaters knit in the round. Can you imagine if every Rowan came with a bonus pop-up pattern in the back, like a McCall's paperdoll? I am going to begin the hunt for a sweet old book to alter!