A 24-page A5 booklet introducing letter formation, with a penguin theme. Print one for each of your group that needs to focus on correct formation, or put a few copies in a handwriting centre as a reference. You could even enlarge to A3, cut the pages in half, then laminate and bind with rings for a wipe-clean re-usable book!
Simply print double-sided, short-edge binding, 100%, on A4 paper. Then staple vertically down the centre with a long-arm stapler, fold in half and you've got a book!