1. go to a fabric store
2. get some gray felt or lenci material
3. get some iron-on stiffening material
4. get some 3/4" or 1" elastic
5. go home and cut the felt/lenci to the length you want your flashes
6. iron-on the stiffening material
7. cut elastic to length
8. hand sew the flashes to the elastic.
9. hand sew the elastic into a loop or add some velcro
10. enjoy your new gray flashes.

works with any color.