I have impressive-looking titles and most of the hardbacks in the sitting room, then paperbacks in DS's room. Books in a series are stored together. Those I rarely read are on the first load, with those I like in front of them. (Maybe get rid of some?) Small shelves for small books, big shelves for big books. Heavy books (eg textbooks) on the bottom shelf. No room for ornaments. DS has his own shelf, but many of his end up horizontal and not vertical. We have a big stash of DS books (the big ones, around A4 size books) under the coffee table too.

Order is just how it took me on the day. I do want a day to rearrange but that isn't going to happen. I just rotate the sitting room books every 3 months or so.

They're not neat, but they are read!