I have a mix at the moment: fat quarters stacked in cd towers, 1-3 yards ruler folded, 4 + on bolts. Scraps are willy-nilly. I do have them mainly by strips or squares though.
My problem is separating by color. I'm a magpie for loud prints and can't always tell the main color.
What do you do if you have a stack from a particular collection? Or from different collections of the same designer? Or the same print in different colorways?
It makes me dizzy just thinking about it. : ) I get partially done and then just stack it all together in a semi-random pile again. Only my holiday fabrics really stay together whatever I do with the rest.