I’ve also had great success with finding homes for bundles of random things on local Facebook “free stuff” pages. Sometimes community groups pipe up when you list them there too. Again, the administration of these solutions is a factor to consider but absolutely worth it when a person turns up and is over the moon with your nan’s books.
I know this may sound blasphemous to the book lovers among us, but if you still have books left after my suggestions above, get crafty. You can stack books to make stands for lamps or rip out pages to use for wrapping gifts.
Books make beautiful signs or if you’re feeling really crafty, turn the spine of the book into a bookmark and recycle the rest of the paper (make sure you remove all glue, fabric, and leather from the pages before recycling).
You can make bows out of books or secret boxes that look like books but store your precious things. Origami stars, hanging shelves, or DIY flower presses . . . books are not just for reading. I’ve even seen a headboard made out of books!