This is so your own personal preference of what you like to have as a finished quilt or what you want to sew on right now. I have seen some wonderful quilts where the scraps were sewn together to make fabric, then the fabric was used to cut blocks or strips or whatever was wanted. Some pieces were used as the applique pieces in houses - sides, doors, roofs, etc. In this case, the scraps were sewn together in color coordinated pieces so that the pieced fabric when used read as one color or as a print of one predominate color. One woman had used her pieced fabric pieces to made a 9 piece and another to make yellow brick road. The quilts were so different and outstanding and certainly had used up the stash! They just had more creativity that the usual scrappy quilt.