My fabric is all in cabinets (bookcases with doors from IKEA); one cabinet has some glass shelves and that's my "UFO zone". Originally it was going to be just two shelves, but I'm afraid it's grown to four and a half. I just stack up everything together; usually that's enough to keep it organized. Sometimes I'll tie things together with selvage 'strings' I keep for such purposes if I'm afraid the stack is going to slide or if I need to sub-divide parts of it.