Sew silk together inside out with 5/8" seam. Leave a 1 " hole at side or end. Mix flaxseed and lavender, fill with paper cone or funnel for neatness. Sew Seam.
If you are cutting up an old silk blouse, use triple thickness for strength. You can omit the lavender or use rosemary or mint. Some people are alergic so less scent insures they will use the gift.
Flaxseed can be purchased in bulk at health food stores. Yes, you can sprinkle it on your cereal, too.
Yes, it was grandma's trick for intestinal health.
Two other tricks for puffy eyes: Cucumber slices or used tea bags. Place on eyes and relax 15 minutes. Whether it's just the 15 minutes with your feet up, or the cucmber, who knows!
Final Comments
Silk is cool, so don't use any other fabric for eye pillows. You can sew up the silk ahead of time and fill right before the gift so that the scent is fresh. If you get crazed, you can make sachet or dream pillows with other fabric, lace for sachet so it will emit scent, velvet for dream pillows filled with mint or rosemary.