Upper left image
QR code can be printed in the corner of the card, it can contain issue url or issue key. There are also options to show issue icon type or to don't show any icon at all.
Color bar
Color bar can represent issue type or issue's project. Colors are chosen by using color picker next to issue type or project. Vertical orientation means that color bar will appear along the left edge of a card, while horizontal orientation means that color bar will appear along the top edge of a card.