I love the chain piecing idea, because it saves thread, and less thread mess to clean up, and time. When I am working on a single block, I feed in leaders and enders where I would normally cut the thread. I just have pieces set aside for this, sometimes it is from the same project and sometimes not. I like to see a block made up, if all blocks are different, so I don't get the parts mixed up, but find the pieces I feed in between add up fast for a scrap clean up of half square triangles, or twosies, for 4 patch.