This belongs to Julie Mooney
It's so easy to just peel and stick them inside a book cover. They can also be put on other things such as crates, baskets, games, etc. Here is a picture of one:
I lend out my books to students and I have a good return rate because these labels really stand out in the front of a book. I prefer to use the shiny jewel tone labels. What do you do to label things?