My fabrics are folded and put on white bookcases that I purchased at Target. They have 5 shelves each and I have 3 of them. I have one shelf devoted to FQ and pre cuts. I fold my fabric using my 6" ruler. I fold my fabric in half length wise and wrap it around the ruler. It is then the perfect size to fit on the shelves with no over hang. I have my solids, dots, stripes and ginghams on shelves by themselves. My novelty and print fabrics are all sorted by either the color of the background or the color that is most prominent. My holiday fabrics are on a shelf by themselves. I do keep my flannels and knits in tubs as they tend to take up a lot of room and I need it for my cottons!
This picture was taken prior to tidying up the shelves so it is a little messy (plus there has been many additional fabrics added!)