I think I've seen this idea around in various forms. Maybe not this exact configuration.
It's a triangle twist with wide wings off of it. It tessellates naturally in three directions, because it's triangular.
In order to fill in the gaps and have it flatten, I made the wings wider in the other three spaces.
It was hard to get a nice photos of it. I don't know why.
Zoom in on the backlit. It's pretty neat.
Had a crease pattern drawn. Lost it. Might draw another and add it.
But it shouldn't be hard to figure. Especially from the non-backlit picture..
It's an interesting little exercise. A little tricky. Nothing crazy.