For 40 years, grey was the ONLY color I didn't have in my stash. A few years ago I was appliqueing a donkey and an elephant on an election quilt, and realized--no grey of any shade. I used a taupey tan for the donkey and the wrong side of a black for the elephant.
I recently bought some Kaffe Fassett fabrics that are grey--one is just grey with huge white polka dots.
Maybe grey is "the new black."