Truly an interesting question because it revolves about one's current frame of mind. I have a couple of drawers in my sewing cabinet full of the left over pieces of projects I have done and they are sorted into plastic bags by color-are uncut. When I get around to making a quilt(s) with them, it will be a controlled use of 'left overs' and have a scrappy look. Then, I also have a basket at the end of my cutting table into which I drop cutting table stuff. If I made a quilt from that, at random, it would truly be a scrap quilt. Like I said, it's the current point of view.