If you’re looking for something really unique and exceptional, check out this tree shaped bookcase. It may not be as functional or as efficient in providing storage space as other units on this list but it’s simply too remarkable to be left out. Add a great whimsical decor statement to a room with these little shelves and put your books or collectibles on display. It isn’t just a piece of furniture, it is a real piece of art. Available on Etsy.