What to do with my stack of old 'hotel grade' dinner napkins?

They would make perfect squares for a quilt, maybe embroidery each one as a flower, bird, or some other object and join them together with strips of colorful material. I did this with color book pages I traced on the fabric and embroidered them or use liquid embroidery. It was various scenes similar to our childhood and I had each grand child added to some of the squares for my mother. It is just one idea that you might like.

You could cut them diagonally into four triangular pieces & hem them ......Sew the flags join them touching one after the other on a flat cord or tape, for kids rooms or for birthday celebration rooms.

You could make cushion covers by sewing three sides together (right sides facing together) turning them right side out and inserting a pillow form, old cushion or batting. Then finish by sewing up the open end.

Hello MizGG, hope this helps you out,

https://www.hgtv.com/design/make-and-celebrate/handmade/7-diy-projects-with-cloth-napkins-pictures