With the colours, as I understand it, she was drawing on a series of correspondences and showing how they relate and interact. For a given card she would take a colour representing the suit (elemental correspondence), a planetary influence, for the court level (if it was one), the position on the Tree of Life including the 'level' or 'world' and then they are shown as 'nesting', 'penetrating', 'lightly influencing' and so on by means of the amount, whether one colour is inside the other, or just a dot.
Tarot cards really are just ink and paper. We can draw from them because of correspondences (inferences, drawing from the collective unconscious, whatever). She made this wholly abstract but it is still genuine tarot. She drew on one aspect of the correspondences, colour, and used that to represent many levels of correspondence.
No doubt I am explaining this badly, but if you do anything more than recite meanings that you have memorized, then you use correspondences when you read.