Can I change the color of a card?

You can fully customize the color of any of your cards.

To do so, tap on a card to open its detail screen, then tap on Customize Card, and tap on the color circle to open the Color Picker which will allow you to fully customize the color of the card.

If you are using an iPad, you can also drag and drop colors from apps such as Aurora and Pastel on top of the Card Preview view at the top of the Card Details screen.