Methods, systems and machine readable media for displaying (e.g., information from multiple calendars) using different secondary colors generated according to primary colors in a data processing system. In one exemplary method, a calendar interface is displayed on a display device, wherein the calendar interface is capable of displaying calendar events for a user, and a control interface is displayed, which control interface allows the user to selectively display calendar events simultaneously from at least two calendars of the user in the calendar interface. Each of the calendars can have a primary color for display; and, secondary colors are automatically determined based on the primary color for the user interface elements associated with a calendar.