I managed to have a go at this design once I got back from the Festival of Quilts yesterday, but I didn't manage to get it online. So today there will be two designs.
The fourth design is Matrix.
It isn't too hard to do, but I did get a bit confused about direction in one of the corners and then I think I put too big a dip into the line so the lines kinda get confused and muddled... but pretty easy to do and looks good!
I will do the next one later... swimming with the monsters first!