Hi Anne, you can buy hex graph paper and just map it out on that with colored pens. I am in the process of making a version of Grandma's flower garden now..not 2 versions combined (how beautiful!)
Have you heard of quilt patties? They come in different sizes and you can use them as the form for each individual piece...saves you from cutting all those hex shapes :D here is a pic of mine in case you didn't see it in the picture thread