i save & use scraps of all sizes. as long as i can use at least a 1/8" seam for mini piecing. when making borders for some of my quilts the splash of colorful confusion adds a great touch. for very small, oddly shaped scraps i just start sewing all together in a strip similar to cq piecing. then lay it out and trim edges straight. the paper & calculater paper methods are new to me & i haven't tried them --yet
). but as long as the years long way i have been doing continues to work for me, i'll probably just continue as i have been doing.