Visual Enhancements for Trello - Customize the Colors of Your Trello Boards
This application is used to customize the colors of your Trello boards by enabling card background colors and headers. There is a simple, easy to use interface that is suitable for both beginners and advanced users.
You will need to add "--" at the start and end of the text for your card to display headers. If this card has a label, then the color of the first label will be used as the color for the header text. If you only have one label, then that label will be hidden, otherwise, you'll still be able to see all the labels displayed.