I made this a couple months ago in an origami workshop with Goran Konjevod.  The subject of the workshop was how to pleat paper without pre-creasing.  It’s an improvisational technique where you don’t worry about making folds equally spaced or parallel.  You just approximate, and watch how it distorts the paper.  And since you’re approximating, you can do stuff like making the lines slightly non-parallel.

My style generally involves more careful planning and precreasing, but I like this technique too!  I imagine if you do it enough, you gain some ability to predict how it will turn out.