Um... the "go hunting" pages?
OK, maybe that's not what you want. I did a quick Google search using "bookcrossing.com/hunt" and "obcz" as the parameters, and selected "images", and came up with several bookshelf photos - though that doesn't necessarily mean that they're current.
The Flickr group "Celebrating BookCrossing Wild Release Photos" ( https://www.flickr.com/---/610310@N25/
) has lots of pictures, though most of those are of individual books rather than bookshelves; still, it could very well be an interesting link in an article about BookCrossing.
There are BCers who've set up Little Free Libraries as OBCZs, and there may be photos of those on both the BookCrossing release-zone pages and the Little Free Library site.
Re the links you posted: that second one led me to a full-page "activate Adobe flash" page, which I found rather off-putting. [I set my Adobe add-on to "ask before displaying", as that saves me from a lot of unwanted visuals. A page that's entirely flash is not generally something I want to trust, so if that page has a text version or some other more accessible "about this page" option, perhaps you could post a link to that instead.]