They are everywhere. Wherever you go you see the colour art therapy books and they have gained in popularity. It is a nice thing to do. You can get digital ones now too! The Coloring Book Club is offering a free download for you to try. You fill in your email address, verify it and then you can download the pdf file. It then also offers a paid version with all the book club support and community. Your choice. I have downloaded my free one. One of the initiatives our school took was to offer colouring in for students on behaviour management. It made such a difference in my experience. It gave the student time to settle down and process what had been happening so that after a lesson they could talk comfortably about what had been a difficult situation which had culminated in their being removed from class. It meant the conversations after that were logical and rational. Colouring in is a powerful tool for self awareness and management.