Look at your books and considering updating titles with an eye towards color and visual interest.
Stack books vertically and horizontally.
Edit your objects for the best impact.
Use objects in unexpected ways.
Trays as backdrops, vases as objects, boxes on top of stacked books - creating a treat for the mind and discerning eye.
below are photos of book shelves I love !!
needless to say, I love monochromatic.