If I love the fabric or know that I will use for applique or piecing, then I keep it in the scrap bin. The rest I cut into 2.5" strips and squares and other sizes - pretty much Bonnie Hunter of Quiltville sizes. I do have bricks-3.5" X 6.5" for fun scrappy quilts. Small pieces are cut into rectangles for sewing to adding machine tape for scrappy border and then there are the postage size pieces. It may depend on your space for storing them and then if you actually will use those cut pieces. You may change your mind as you develop your style of quilting.