I thought about how important colour is and the impressions it leaves as well as the way it can influence our feelings about something. Whether or not colour is intentional in a Tarot card, I feel it certainly aids with the overall feeling of the card.
Look at the Sun Tarot card from the Morgan-Greer Tarot deck and the yellow surrounding the orange sun with the yellow sunflowers.
Jumping into the card, I get a sense of warmth and clarity. I feel a sense of harmony and unity and I also feel happy. There is a definite sense of intellect and creativity. It makes you want to do things with the energy it provides.
I will look at other colours in Tarot cards over time.