If it is recognized as a certain design from someone else it is not an original design. If you ( design) a quilt using someone else's pattern as a base you should acknowledge that, on the label and in Any/All on line postings/pictures state ( based on the pattern _------, by _--------) to avoid any questions/issues. To me its simply not an original if you use someone else's pattern. An original
Is made from scratch- with your own sketches ( computer design software if used) own ideas.... Your own design