My cousin had a large commissioned wallhanging to do with premade antique squares done by the grandmother (after we figured out how best to piece these shakey squares together...
She later called me and told me this is what she did (pillowcase technique) instead of binding it...She then used low loft cotton batting, tossed it in the dryer which gave it that old fashioned puckered look.... It turned out gorgeous
EDIT: Forgot to mention that she also borderd the back in one color and surrounding each block, doing the same to the front...So it looks like a different colored framing border both front and back...