In primary school, we did this with a piece of cardboard by cutting /\/\/\ at the top and bottom and inserting a knitting needle as the cylinder comb for doing a batch of alternate lines at the same time.

It was 40 years ago but clear as day because I really enjoyed it. I made a coastal landscape with boats and it was very programmery to build up a real image from scan-lines. Making an abstract repeating pattern like the examples wouldn't be half as engaging.