These designs of mine are called Infinity 4 X 4 because as one continuous line it reminds me of the infinity symbol and because this variation has a 4 X 4 centre pattern.

I have added a rough sketch of the basic Infinity Design which has a 2 X 2 centre and some of the simplest designs possible using the 2 X 2 centre.

These ones were originally pencil drawings that I photographed and then manipulated in Photoshop.