Thanks for the comments guys. They are really fun to make. I started with just using scraps as leaders and enders while I was working on other things... and then got hooked! It is a lot of work, but I'm not on deadline since it's just for us.
ranger, I'd love to see pix of your crumb-work if you have any. I also work on these when I just have a few minutes to sew or am frustrated with projects. It's a good break and I feel all resourceful using up every bit of fabric.