Several people have expressed a desire for a step-by-step tutorial on these blocks, so I took pictures of my progress this weekend. Please let me know if you still have questions!
Start with a bunch of strips of various widths plus crumbs, which are small pieces of fabric. Square and rectangular crumbs are the easiest to use, but you can also use odd shapes as long as you leave enough space between crumbs so you can cut the edge at an angle. Put a strip face up on the bed of your machine and start sewing crumbs along the strip. When you get to the end of the strip add another strip, chain sewing them all together. You can also use leftover triangle squares, flying geese, ends of strata, etc. along with your crumbs. Butt the crumbs together very closely so you need make only one cut when cutting them apart.
When you've chained a bunch of strips take them to the ironing board. Press the seams to one side - I like to press toward the long strip even though it's easier to press in the other direction.
When you've pressed all the crumb-strips take them to the cutting table. Cut the strips between each crumb.
Now you have a bunch of larger crumb pieces. Repeat the process all over again, sewing these to new strips. You can go around log cabin style, sew parallel seams or whatever you feel like doing. I place the big crumbs on the new strips in as many different directions as possible. I don't pay any attention as to which fabrics are next to other fabrics.
Once again, when all are stitched to strips, repeat the pressing and slicing apart. Some blocks will grow faster than others because the crumbs used are bigger. As you run out of large multi-piece crumbs start over adding small crumbs to the strip until you reach the end.
Continue doing this until your pieces are large enough to trim into the size block you desire. I'm doing 6 1/2" unfinished blocks as I like this size block - not too big or too small. Trim the blocks to size and repeat again and again until you have the number of blocks you want for your quilt. These can be set in any way you like, just like any other blocks.
Like string blocks, these are very addicting to make. They are called Crumb Caos blocks because they are so random and unplanned. They are also very quick to make. The first time I made them I think I made 25 or more blocks in one afternoon of sewing.
Enjoy, and post your blocks on your blog for us all to see!