"My testimony grows when I read the scriptures"
I got a plant from my garden - in this case Aloe Vera because it grows easily and that little plant can turn into numerous plants all on it's own. Also Aloe Vera can be used to heal many things.
I had a few little seedling pots, so I covered them in scrapbook paper and put potting mix and the seedling in it. With the book mark which says "My testimony grows when I read the scriptures" it makes a cute little handout that can be a regular reminder to read the scriptures.
Another option would be to attach a packet of sees to the book mark.
I got the book marks from an old folder of my mums when she was a Young Women's President in the 90's. You could create something similar by either drawing some flowers or making a bookmark with a flower out of card.