Hi,
You really don't need a good source except your brain!! Determine the size of the quilt you would like and draw a design on the fabric (usually muslin or a plain fabric). If you are good at drawing go for it. If not use templates.
Many years ago I made one 108" x 108", all hand quilted. Took me a couple of years. I had the design drawn by a woman that did this in Canada.
Emily, FL