Tomohiro Tachi (website, flickr) has some wonderful animated 3D simulations of paper folding- I really like this one of a waterbomb tessellation/corrugation pattern being manipulated and changing size/shape/orientation. One of my most favorite things to do with pleated paper is to make strange and different shapes out of them, and this video shows that process in action…

It reminds me a lot of this design by my friend Sipho Mabona: