Friends of the Folsom Public Library (CA) offer library supporters a choice of wood or ceramic book spines. Donations to the Children's area yield a ceramic book spine with one line of text; Donations to the Adult area cost 3x more for a wood book spine with two lines of text.
Wouldn't a border or shelves of wooden book spines be a fun indoor entrance to a library? Each year, it could grow. This could be good way to make school libraries more visible -- they often have no fancy signage, even though all students and staff know where it is. My experience as a visitor to school campuses is that after registering at the office, I ask students to point the way to the library. Someday, I'd like to see a "book" trail to the library -- painted, wood, or ceramic book spines would really make a statement that schools are academic institutions.