If the wash-away stabalizer is used to applique, do the applique stitches follow the pattern in the hanky?
I also read a brief blurb about a certain fusible interfacing that didn't make them stiff. I didn't have time to look at it more this morning.
With the scalloped and lacy edges (I have many like that) I think stitching it down to the background would probably be best. Depends with lace though if you want to leave it loose and just stitch around the edge before the lace.
I saw this one online and I like how they're folded. I have some with the corner embroidery like that.
http://community.webshots.com/album/467212738WmWmdK