Just to be clear, the flipping page animation is still there in iBooks. What's missing (if you like that sort of things) is the "open book" look, and also the wooden bookshelf.
I made a quick search using AppZapp and came across an app called iBouquiniste. It has a bookshelf and open book design, implemented in a rather elegant way at a quick glance. There is a Lite version so you should be able to try it out for free. I haven't tried it myself but it seems to have good reviews.
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