I also got out a "Quilt Pack" published by Tyne and Wear Museum Service in the 1990's - it has some design motifs and three post cards. Here is the design called variously shell or goose tail. I also found my original handwritten notes taken during a work shop given by Dorothy Osler in the early 90's. I will have to read these more carefully. We marked a cot quilt in the Durham style but I have to confess that I never completed the project. Dorothy gave a talk at an Area Day and gave a workshop the next day -the Area Day was at RAF Bentwaters, a huge American Base which closed very suddenly.
And here is Goosewing, essentially, half a curved feather. This is used as a border element and also as a central motif; its curve makes it very attractive, especially in pairs.