Half a croissant, on a plate, with a sign in front of it saying '50c'
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Flag Features Continuously Changing Color Waves Or Animation

Multiple layers of thin flexible plastic with different colored liquids between.
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Three or four very thin layers of colored liquid separated by plastic sheets would produce dynamic effects in the wind.

I believe the closest thing was light shows here in San Francisco in the 1960s where they'd have an overhead projector that would show some sort of liquid psychedelic light show behind the rock band playing. I think they'd shake it around or something while everybody was on acid.

This would be different, the waves would interact with the wind making very specific undulating and moving wave pattern so you wouldn't need as much LSD to enjoy the effect.

ADDENDUM: Diffraction gratings with multiple pictures could actually create an animated image in the wind. Somebody waving or something.

doctorremulac3, Jan 10 2023

The basic idea only wouldn't look like a spilled pot of stew. https://www.youtube...watch?v=TW733Ut5zE0
[doctorremulac3, Jan 10 2023]

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       Whatabout those iridescent film coat jobs you occasionally see on fanboy Camaros? As long as your national colors are teal and violet, they would seem a great fit.
RayfordSteele, Jan 10 2023
  

       You know, that's a great idea. Another approach would be diffraction gratings.   

       Whoa, with dual picture diffraction gratings you can have two pictures animated! I'll add that.
doctorremulac3, Jan 10 2023
  
      
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