Fold tile in half diagonally then unfold. Fold lower right edge to center line.
Fold left lower edge to center line.
Now you have a kite fold. Flip it over.
Arrange with the narrow end pointing to the center.
Arrange with the wide end pointing to the center and overlap them.
Print tiles in two sizes and patterns. Arrange the first layer with the narrow end in and the second layer with the wide end in.
Same as before but arrange the first layer with the wide end in and the second layer with the narrow end in.