Play with color, wave height, waves, shadow. I sliced South Korean flag image into 200 costumes, each a vertical strip. Code keeps left end of flag still, sets shadows as brightness, then stamps lines, all with sine functions.
Last year a Scratcher noted my logo looked like the South Korean flag. A few days ago another noted, on my profile, the resemblance. Coincidental resemblance, but now I've taken an interest in that flag. Couldn't use the same code as my multinational flags: https://scratch.mit.edu.mit.edu/projects/711574868/ but I used the same code as for my Wales flag, slightly modified. National anthem of South Korea, performed by the United States Navy Band (listed that way on Wikimedia listed as public domain)