Check out the book...Trapunto By Machine... By Hari Walner. Also consider a series of stencils. One of the stencil manufactures produced a series of stencils based on whole cloth quilts in the collection of Old Sturbridge Village. Stencils are available that can be combined into larger sizes. Since I have designed many in all sizes, it would take much space to give all info. Perhaps these suggestions will get you started.