I found this book the other day and I thought it was so unique! It's What Makes a Rainbow? by Betty Schwartz and is a magic ribbon book (the unique part). http://www.amazon.com/What-Makes-Rainbow-Magic-Ribbon/dp/1581170769/ref=la_B001HD0WDO_1_1?ie=UTF8&qid=1362950988&sr=1-1

I also love the Noodle touch and feels series by Nosy Crow and Marion Billet because of the sticky pages, like toothpaste and peaches, which I have not seen in other books and is a different sensation for LO. http://www.amazon.com/Noodle-Loves-Bedtime-Nosy-Crow/dp/0763658766/ref=sr_1_4?s=books&ie=UTF8&qid=1362951030&sr=1-4&keywords=noodle

What unique books do you like?