Originally Posted by
Sheepshed
It looks like more of a technique, as someone said. Take big squares of fabric, run your rotary cutter randomly over it, put a strip of contrasting fabric behind it, and turn the edges under leaving a little conrast showing, square up. You could also topstitch the raw edges to the little contrasting strip, and square up.
Since I'm lazy by nature, I'd add to the UN-cut squares and not cut anything beside the base squares and bias strips.