I have a bunch of beautiful old hankies also.
One thing I did with mine is I made kitchen curtains out of beautiful all white, embroidered hankies. The curtains are light and breazy and pretty.
I made the lower half of the window curtains by just whip stitching them together by hand and hung them with clip curtain rings. Then I made valences for the top of the windows with hankies that had just an embroidered or lacy section in the corner and folded these in half diagonally so the fancy section shows. I overlapped these over the top curtain rod.
They look so cool and very different.