The aesthetic appeal of the image mosaic really depends on the range and intensity of colours in the input video.
Some films don't have a hugely varied palette, so the rainbow effect in the output is weak or vague.
Here are some examples of films that had a pleasing result:
From Twitter comes Daniel Pett's great example, using an item from the collection of the British Museum. Have a look here!
Der Student von Prag (Stellan Rye & Paul Wegener, DE 1913):
Purple Rain (Albert Magnoli, US 1984):
(For more Prince, click here)
Sedmikrásky aka Daisies (Věra Chytilová, CZ 1966):
The script can also be used for black-and-white films.
Les yeux sans visage aka Eyes without a Face (Georges Franju, FR 1960):
