I have a small amount of true gray. I have been collecting dark gray (gunmetal or hematite?) to bind a super bright very colorful quilt but the other grays I have are few, and mostly printed in some form of pattern like rocks or slate or such.
Since I have just started stash building this year my collection is relatively small. Focus fabrics are easy for me to find and this year I have forced myself (with a good bit of success) to seek blenders and neutrals. I think the next thing I'll have to focus on is pales so I can get contrast in values, almost all the fabrics I 'see' that call to me are darks.