i use pizza boxes too- i've purchased (unlabeled) boxes from a local pizza parlor, i cover them (decorate them) with fabric and have a varietyof sizes to fit many different block/projects- they stack neatly on my closet shelf and being (color coded) it's easy for me to pull out the one i want when i need it- works well for me since i seem to always have 6+ projects going at a time.