I hate throwing things out – having cut the biggest 2×1 rectangle possible from an A2 sheet, I was left with a lovely thin strip of scrap:

I was playing with a corrugation, with the view to design a millipede, but stumbled across a molecule that I then tessellated along the length.

By starting in the middle, the molecules at each end let me then inter-lock the structure into a ring – a lovely thing indeed.

I think each molecule is very similar to many of the flip-top boxes, like those designed by Brill and others. I am not sure if this is original, but it certainly came out of my head.