My grandmother would deliberately change something in a quilt to give it imperfection, and would say only God is perfect. She was Irish, and lived in the mountains of Tn. She would leave an edge out, change a color, reverse a pattern. It also dealt with evil being confused, much as a dream catcher does, or peircing of ears were to confound the evil. She was extremely religious (idle hands are the devils playground) and superstitious. Everything has its basis in life. Even the unleavend bread of Egypt. If it is folklore then it may have its basis in Ariadne and her spinning. Most folklore is based in life. Even the superstitions, have a source should you dig deep enough. How many people have become crushed, or sought death by seeking perfection, It is alright to fail, the world will not end.