KalamaQuilts

Necktie fabric is not like quilt fabric, it doesn't behave at all ... cut a 4" square and by the time you set it aside it is practically round.

Not all of the ties I cut up were silk, there were poly ties also but they are just as unruly as silk.
It will ruin your cutting mat so cut on the back side or use an old one. The silk fibers are so fine they seem to sink into the mat.
I chose not to interface, instead I made use of the wonky fabric by making flat biscuits.
I can't remember the size any more but for instance if my cut was 4" I basted it onto a 3 or 3.5" muslin backing.
I made this many years ago, but it still remains one of my favorite works. I think it is about 30"X45".
(It is hanging at home and I'm not there)

If you can get your machines resharpened you can certainly try it...

I folded and pinned the excess fabric to give a fold on each side of the base block.
It seems like about 18 ties equaled a yard of fabric.

Stitched them with a 1/8" seam, pressed flat, which makes a lovely little center treatment, and then sewed tie and foundation at 1/4" as usual.
I've included a side view of the same technique in a water color quilt so you can see the texture