I bought the large clear plastic drawer units. I spent a full weekend organizing. I love it. The only problem is not enough room for one more unit. (DH says the problem is too much fabric. But, we all know that is not the problem. :lol: )
I organized by color mainly. The large drawers have the larger pieces.
I have a couple of fat quarter drawers, a fall/halloween, and a Christmas drawer. I still have a few tubs with fabric for specialty type quilts like crazy quilts, old linens, tub of fleece for craft projects, and a tub of things like wonderunder.
My room is also our study and extra bedroom. I have everything, (almost in the closet). This has made my quilting life so much easier.