I suppose I should go read over all the stuff I printed off on crumb quilts, but this just occurred to me - I've washed and am ironing (and starching) all my scraps and pieces - hopefully later I'll get to start sewing. So then I get this big irregular piece ----- how do I cut a square out of it? Do I just use my big ruler or is there a square template for this sort of thing? And what size should I make it? Is there some standard?