I throw nothing away. I use all my scraps no matter how small. I use them as starters & enders on my other projects. Like the small triangles I trim off, I sew them together, then start another block. When I come to the end of sewing a seam, I will will put two tiny triangles together (called an ender) & continue sewing, then cut the first block seam away from that. Then start another block seam behind the small triangle (called a starter). It also makes use of the thread strings you usually cut off. Saves thread also as you have used the trow away thread strings. When I have several of the made up, I will then use them again as starter & enders to make star blocks, 9 patch or whatever. I have several star blocks that are only 4 inches square & 9 patches that are 2 1/2 inches square. I even save 1/2 inch strips to wind around cloths line rope to make bowls & hot pads. They make great gifts.