A paper clip works well as a bookmark, especially if you are carry books in a bag or backpack. The paperclip won't fall out the way a loose bookmark can.
This page contains the following solutions.
As one of Jehovah's Witnesses, I use my Bible on a daily basis. My Bible only has 1 piece of ribbon as a place mark. During my Bible reading, I find a lot of Scriptures I would like to remember, so this is what I did.
I have lots of wallet size photos from my own kids' school photos and also photos of my friends' kids. I use them as book (and magazine or cookbook) markers...
You'll never be without a bookmark if you get junk mail. Just clip off a corner of an envelope in a triangle. Either use it plain or let one of your children decorate it for you.
Since reading is one of my past times, I always have many kinds of bookmarks on hand. One of them is the simple rubber band. Every time I take a break from reading, I just insert my rubber band as my bookmark. Simple yet helpful.
This is a page about bookmark craft ideas. Handmade bookmarks are a great gift for the avid reader and a creative project for the maker.