How do you spell that color ranging from black to white?  Here's a general explanation.
grAy is how it's spelled in America 
grEy is how it's spelled in England
Since I live in America I'll stick with grAy.  But either way, gray is one of those almost non-colors.  Unless I need it for a specific design purpose it's not too high on my "gotta have" list.  Reminds me of winter.
Nature displays gray in a wide range of textures and intensities. I can almost feel the grain on the crosscut timber and the smooth or rough bark of these two tree close-ups taken on a recent trip to North Carolina.  



Gray is found in all five of my quilts about our five senses.  For full images of these quilts see the 
Gallery of Quilts/Simply Sensational(series) or type a quilt title in the search box at the top left of home page.
Delicious, detail:

Fragrant Memories, detail:

In the Quiet, detail:

Breeze, detail:

Photogenic, detail: