Always an interesting question. When I sew I let my scraps fall into a basket beside my cutting table. When it gets full to overflowing (like it is today) I sort it out into piles by color. I trim the pieces of odd slivers that came about as I cut elements of the previous projects. Then I put them in plastic bags by color and store them in drawers. This gives me maximum opportunity to choose what I need. For a long time I cut them into strips and squares-only to find that I needed something 'bigger' and had to cut into my regular stash storage. I encourage my quilting friends to come and see what they can find and use. I might add that when it comes to batting I keep each type and brand and type separate. I cut all scraps into the largest square or rectangular shape and sew them together with zig-zag stitches and make large pieces which I use in other projects. I do not mix them at random because each type behaves differently after being washed and I don't want that sort of look.