This cute Bear with Hearts sashiko sampler is designed with larger printed stitch lines making it a good choice if you are looking for a project for a child who wants to start hand stitching. The manufacturer calls it a "finger training" sashiko sampler because it teaches making even length stitches by stitching over the marked lines.
Printed on white fabric.
Use sashiko thread and a sashiko needle.
You don't need a hoop to do sashiko stitching, you simply gather the fabric comfortably in your hand and stitch. This allows putting multiple stitches on your needle. However if a younger child has trouble keeping their stitches from becoming too tight, I know some have had a happier experience using an embroidery hoop to keep the fabric taught while stitching. The important thing is they enjoy the project.
Finished stitched area 12" x 12".
The printed dash lines wash away easily after the stitching is finished so don't worry about the lines being covered perfectly. This fabric and the sashiko thread will become prettier after being washed a few times. Be sure to finish any raw edges first, but then you can throw it in the washer and dryer.