Making my own library is actually an option I'd consider at some point. Not for the place I am now--but hopefully one day I'll have something better. Right now I'm at "I live here" not "this is home." Although whether I ever have a designated library is anyone's guess... A lot I suppose depends on my mood, the place I live, and whether I live alone.
Years back, somewhere between the time my father left my mother, and the point we had to move out of my childhood home, our living room got renamed the library. I can't remember if it was my idea or not... My mother certainly would also have liked a library. In a way, that room would have been an ideal library--there was fireplace, and plenty of wall space for bookcases. Although the bookcases lining the walls never happened. There were a few books, but not really enough to earn the name "library." At least there was something--about that time, we renamed the family room "the drawing room." Classy name for a room that was almost empty and never used for much all the years we lived in that house.