The braided technique is going to start to work best when you have a triangle shape but you can start with an oddly shaped crumb and build it up to a triangle shape if you like.
It doesn’t matter which side you add your second scrap to the first. Just find a straight edge on your first scrap and add a second, right side together.
Each time you add a new scrap make sure to press your unit with an iron before adding the next scrap.
Trim this two-piece scrap unit so that it has straight sides again.