You know the ones. Once they were shiny and new, or at least new to you. But they've been on your shelves for five years or longer, and you don't even see them anymore. Refresh your bookshelves by either reading those long-owned books or releasing them to your DNF list and out of your house to someone else who will appreciate them. 

This challenge is particularly for physically-owned books, but if you want to apply to audiobooks or e-books you've owned for a long time, go for it. My goal is to read or release at least 8 books this year, but I'm adding plenty of bonus books for the ambitious.