The book The Mitten is by Jan Brett. She has lots of wonderful children's books out, and she is best known for her intricate illustrations. If they like The Mitten, try The Hat. She has a website, too. Her books have been around for a long time, so they should be very easy to find. I've been working on my knitting and purling tonight--very uneven. Oh well. Kindergartners are very forgiving.