Roberto Gretter is an interesting designer, this is one of his model: the star turtle, folded from a hexagon, 18 cm. It's a nice model, I enjoyed folding it. This little origami turtle is now walking on a field of lentils ;-))
I don't know how this Japanese paper is called, but it has more or less the same structure as elephant hide.
Model: origami Star turtle/ Tartaruga stellata
Design by Roberto Gretter
You can find the diagrams
here.
