This seems perfect for anyone in that reading Tarot with synesthesia thread. Picking your own colors for the cards rather than just copying the deck closest to your hand could be fantastic.
Or, maybe even more interesting…
You could color in the traditional RWS artwork, but use something like the Dark Wood Tarot deck as your reference. Help you spend more time mindfully with the deck and really understand where it’s different (and where it’s the same) as the RWS.
I’m absolutely going to do this now.