pygame.surface

[Windspar]

add function before while loop and this after function.

background = create_background(size)

Line 62 replace screen.fill(WHITE).

screen.blit(background, (0,0))

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imagelist = [filename for filename in cd.iterdir() if filename.suffix in ['.png', '.jpg', '.bmp']]
starChoice = (random.choice(imagelist))

imagelist filename is a pathlib class. It is not a string.
try.

StarColor = pygame.image.load(str(starChoice))