Unfortunately the posts no longer exists so you'll have to use this photo for inspiration. But what I would do to make it is decoupage a regular birdhouse with book pages and then add a book on top! It would be very fun to do a winter-hemed board book birdhouse for this time of year, or even for any holiday.
I found this birdhouse on Daily Danny – an eco-friendly blog by green living expert Danny Seo – and it reminded me of a funny story. You see, I LOVED The Fox & Hound when I was little. So much so that my mom ordered me a personalized Fox & Hound story where the printer puts the child's (my) name in the text (see an example of what I'm talking about here). The problem is that I thought the book was really about me – that someone had written it specially about yours truly. My best friend Stephani's name was even in there, so I was sure! I guess I was a very literal child. Anyhoo, seeing this Fox & Hound book birdhouse brings it all back. And makes me smile.