One other note I will make before starting the tutorial is that crumb blocks aren't meant to be huge. They get really tedious to sew any larger than 5" finished. Good sizes are 3", 4", and 5" finished. Mine are 4" finished.
First, I put out a pile of my crumbs. What are crumbs? They are the little bits and pieces left from trimming that can't be used for anything else. They are the bits left from bindings and applique too!
I took two pieces out.
Next stop is sewing them together. They had straight edges so I just lined them up.
Next it is time to add another piece. The seams do not line up, but that is okay. I just sewed against the pink piece and then trimmed off the excess. There is waste in crumb sewing, but this is the end of the line anyway as far as fabric is concerned!
You can see in this picture where I would have trimmed off the extra stuff.
Here is the completed, untrimmed block. The block here is 4.5" unfinished.
And here I go! One crumb block. In order for this to go fast, I have my ironing board situated right next to my sewing machine. I don't even have to get up! If this is not possible for you, then work on a few crumb blocks at once. Sew some pieces together, trim any extra stuff off as needed, iron, then repeat until your blocks are bigger than what you need.