This method is all about how to turn the strangely shaped fabric off cuts from a sewing or quilting project into yardage of fabric that is all the same colour or pattern.
Set your stitch to a zig zag stitch. I usually go for a 2 or 2.5 stitch length to make sure my stitch catches both of the pieces of scrap I am trying to join.
I trim my made fabric just enough so that I have straight edges, but if you want a particular size, like a pre-cut size or strips then you can do that at this stage.