Grinning Triangles Origami Tessellation
This is an idea I had very suddenly and pretty much out of nowhere.
It's probably been done many times before, but I had not previously come across it.
It's hexagons and two sizes of triangles.
I actually began by just placing the two sizes of triangles in groups and realized the hexagons were needed.
The hexagons and small triangles are on one side and the large triangles are on the other.
Instead of twists, it employs that technique of folding a small hexagon in on itself to create a triangle on the opposite side.
It was not too difficult to fold.
A lot of prep work was involved before the actual collapsing is ready to happen.
Ordinary paper held up pretty nicely during the process.