Materials: clips, drill, Nisse folding chair, washing line
Had this broken Nisse chair from which I removed the plastic seat and back, and kept the frame. Removing the back was a bit more difficult; I used the drill to break the fixed screws open. I went for a turquoise washing line (first version was in red), and wove it around in patterns using different spacing.
Used clips to hold the cord together while working and drilled small holes on the back of the frame to fasten the ends of the cord. More on this chair here: