Don't stick with those ready-to-buy yarn bookmarks. They are just too mainstream. Your kid deserve something cooler than that. Why not attach a pompom on a popsicle stick? It is not very costly and a pompom is easier to find than a string. That scruffy thing will make your kid want to read a book in an instant.
Is your kid the kind who does not want to carry a bag in going to school and ends up losing his books and notebooks every now and then? Your old belt will help you solve the problem. This has some sort of classic feels to it which will cost you nothing. It will help keep books and notebooks intact and your kid will never lose anything again.
Are the pages of your kid's favorite book starting to fall off. Don't ditch that book just yet. All you need are pieces of cloth, a zipper and adhesive. Your kid will never lose a single page of his/her book again. The fun part of this is you can customize it yourself or according to your kids' likes.