I made four different "fabric and marble" toys. You can use them while commuting to school, while waiting at the doctor's waiting room or any other occasion and ut helps to prevent geting bored.
It is so simple to make, cut a fabric rectangle, put right sides together, sew and cut angles, turn around and put one marble inside, then you sew the fourth margin of the fabric.
You can use your own pattern to pust the marble around, beware only to have "paths" for the marble to travel wide enough
Have fun while fighting off boredom!