Larger pieces by color (and some by type like hand dyes and batiks). Fat quarters in a flat tray basket arranged by color so I can see what I have. Smaller pieces I roll up with the raw edges inward, tie with a piece of inexpensive ribbon and stuff into a basket (again, so I can see what I have). Good luck with your organizing. Saves a ton of time later when you "just know" you have that special piece of fabric somewhere, if you could only remember where.