Perhaps I had better say that this post is by way of thinking aloud, what I'm going to say is purely a personal thought and if anyone wants to say I'm talking rubbish I won't disagree.
I have thought of a possible way to divide up the tarot cards (based on the Rider-Waite-Smith deck). It is somewhat arbitrary since it came out of thinking about the background colours.
In the RWS deck there are only a few background colours used, and I wanted to attribute a meaning to them. It's possible that I will think more about the backgrounds because sometimes they are something slightly hidden which might be revealed, or provide an environment for the action of the card, or sometimes are literally like a stage backdrop.
By far the most have a blue background, but I am starting with the ones with a yellow background. I am taking my cue from the Fool for this with its predominantly yellow background (although the sun itself is white) and I've decided to attribute a theme or enlightenment or illumination to the cards with a yellow background.
The Fool also has a line in the background of the two other predominant background colours: blue of various shades, and a sort of greyish white.
I have arbitrarily taken the 7 of Cups as my hint here and am attributing a theme of instability or things changing to these cards with blue backgrounds.
Conversely I am attributing a theme of things being stable or solid to the cards with a greyish white background. This may seem strange when Death, the ultimate change, has this background. However I am taking it that death refers to an expected, inevitable change, which is therefore actually stable and unchangeable.
Once again I will stress that this is just a thought and so shouldn't be treated as gospel: you won't find these attributions anywhere in the literature.
The few cards with a black background presented me with a few difficulties, although since they all depict difficult moments of decision and power (I'm taking 3 of Pentacles to refer to a situation where you have to get on with it and make the situation what you will, with the dark background through the doorway representing a future that still has to be created), I have taken them to refer to traumas, initiations and negotiations of power.
This leaves only two which don't fit in. I am taking the reddy-orange of the Emperor to mean authority and the snow of the 5 of Pentacles to mean being outside in the cold so you're not seeing the real background at all.
I will play with this idea and see how I get on with it. Once again I'm struck how tarot strikes one differently at different times.
Oh, there's something we have to do still: