I mostly go by color but if I have most of a collection, I'll put them together. Plus my batiks are together mostly by color and anything on a bolt is by color. Scraps are by size, fat qtrs and jelly rolls are near their color or where ever I can stuff them.
This photo is only some of my fabrics since last 2020 as I haven't bought any since 11/2018 when I put myself on a "FREEZE". Photo doesn't show all the partial bolts stashed under the pressing station, along the back side of the cutting table or under my quilt frame in the next room. Plus the batiks are in the next room too.