I think these are cute, but I would use them for something outside the box. I would use them in my classroom for students with ADHD. Sometimes students need what is called a fidget to keep themselves on task. They could use it and be given inspirational messages at the same time.
Prayer rocks for Kids David's sister made prayer rocks for the kids, but wrote a different prayer subject on each one, such as "happy" "fear" "Mom" "Dad." She also put them one a cute little shelf to be hung on the wall. The kids love them!