The Usher siblings' colour coding, seen in their clothes and especially prominent during their final scenes are a reference to the Poe story "The Masque of the Red Death" (which is the name and plot of Prospero's episode).
In the story, Prince Prospero has sealed off his castle while a horrible plague called the Red Death sweeps across the land. To entertain himself and his court, he holds a masquerade. The masquerade is held in a succession of rooms, each with a stained glass window of a different colour, and the room is then decorated to match that colour.
These windows were of stained glass whose colour varied in accordance with the prevailing hue of the decorations of the chamber into which it opened. That at the eastern extremity was hung, for example in blue—and vividly blue were its windows. The second chamber was purple in its ornaments and tapestries, and here the panes were purple. The third was green throughout, and so were the casements. The fourth was furnished and lighted with orange—the fifth with white—the sixth with violet. The seventh apartment was closely shrouded in black velvet tapestries that hung all over the ceiling and down the walls, falling in heavy folds upon a carpet of the same material and hue. But in this chamber only, the colour of the windows failed to correspond with the decorations. The panes here were scarlet—a deep blood colour.
Each of the Usher siblings' palette, and the camera filters for their deaths, has a colour corresponding to the ballrooms in the story - I think Camille is a combination of blue and white, since she's more of a light blue, plus her white hair.
I see what you did there Mr Flanagan
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