Frank J. Wilstach, comp. A Dictionary of Similes. 1916.

Gray

Gray as grannun’s cat.
—Anonymous

Gray as the inside of a pewter dish.
—Anonymous

Gray hairs are like the light of a soft moon, silvering over the evening of life.
—Anonymous

Grey as a badger.
—Richard Harris Barham

Gray as shallow sea.
—Cuchulain

Grey as a hoary monolith.
—Gilbert K. Chesterton

Misty gray, like a cow’s breath on a frosty morning.
—Irvin S. Cobb

Grey as time.
—George Darley

Gray, like a shield embossed in silver.
—Henry W. Longfellow

Grey, like the soft creeping twilight.
—William Morris

Gray as smoke.
—John G. Neihardt

Gray as glass.
—William Shakespeare

Grey, like a storm-extinguished day.
—Percy Bysshe Shelley

Grey as a flower ruined.
—Algernon Charles Swinburne

Grey as the morn.
—John Aaddington Symonds

Her eyes are grey like morning dew.
—William Butler Yeats