I don't have any other uses for books except reading. I probably couldn't use it for a doorstop or to hide money in it. I'd worry about it getting damaged and worry that my money wouldn't be safe in it. The only non-reading thing I do with books is sort of use them as motivational posters. Whenever I write I either pick my favourite books by my favourite authors or books that are a similar genre to what I'm writing. I prop them up on my desk or out in front of me if I'm writing somewhere else and keep them near me to look out. Looking at my favourite books or similar genres helps me keep the excitement and determination of selling a book.
It probably doesn't count but I did use a university textbook once to kill a huge spider. I ended up with housemates who also had a terrible fear of them and it took all three of us to kill it. One dropped a large pizza box on it, I dropped the textbook on top of the pizza box for extra weight and the other then jumped up and down on the battered box.
We had to make sure it was dead. That thing was a mutant and we couldn't let it get away alive.
Join in on today's Road Trip Wednesday! What are your other uses for books?