I have been trying to sketch some of the samples that I have been making, here are the results.
Accordian pleats drawn using pencil
Pencil sketch of rotational pleats.
Pencil sketch of knife pleats
Melted wax and oil pastel sketch of fused plastic bags.
Melted oil pastel sketch of fused plastic bags.
Oil pastel sketch of bubble wrap and plastic bag sample. Scissors used to scratch back layers to form bubbles.