The easiest way for me was to get a core from an empty bolt (fabric shops, even Joann, are usually very happy to give them to you), cover it with a very slippery fabric (doesn't have to be neat, just wrap and staple). Then, I just roll the fabric onto the bolt core, slide the core out and fold the fabric once.
I don't have a pic of my current stash, but I've been doing this for a long time and you can see a pic of my older, much smaller!, stash in the sewing room webshots album. I'm still using the white wire cubbies, from Target. You can just add cubes as needed.