I saw this fabric organizing idea on Pinterest. You cut hanging file folders in half and use them to "file" the fabric in a filing cabinet or box. I gave it a try, and I like the results. Not only is it all neatly stored, but you can easily see how fabrics look next to each other.
Here is the original tutorial from Karen at Sew Many Ways. The only thing that is bothering me is that my fabric isn't all folded at the same width like Karen's. It will eat away at me until I refold it all.