Methods and Ideas
For example, some ties have a reverse side that is just as much fun as the front.
Here's one of my peek-a-boo neckties
If I were using that tie in a purse (or any sewn item), I'd want to showcase it somehow.
Other ties have text describing the tie or the designer, and these areas (usually on the reverse side) can be cut out and used like a "fussy cut" on a quilt.
This Degas necktie is part of a blazer (by Studio Fresca), but the idea is easily applicable on a purse strap, buckle, pocket, etc.
(click on images to enlarge)
And don't forget the labels!
This entire jacket, by Undone Clothing, is made from clothing labels!
Isn't it fantastic?
So that should give you some ideas on what can be done with the labels from neckties
This amazing quilt (posted by Patra Cat, I think she saw this quilt in a show)
uses both necktie fabric and necktie labels
Collage is another idea to consider.
You can take several images from neckties, iron the ties onto a fusible (I like Steam-a-Seam), cut out the pictures, and layer them.
You can stitch the edges down, so no seams are needed (unless you want to turn seams under and applique).
Here I started layering a bookmark
All of the fabrics are from neckties, except the text (that is from some boxer shorts)
This method would be an incredible way to personalize a purse.