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The article below will explain how to change the color of your calendars and reminders:
You can change the color of any calendar and its events or of any reminder list and its reminders. (Reminder lists are available in Mac OS X version 10.7.2 or later.)
- To change a calendar’s color, click Calendars (in the top-left corner of the iCal window), and select the calendar by clicking its name in the Calendars pop-up list.
- To change a reminder list’s color, click Reminders (below the search field in the iCal window), and select the reminder list by clicking its name in the Reminders pop-up list. (If you don’t see the Reminders pop-up list, choose View > Show Reminders.
- Choose Edit > Get Info.
- Choose a new color from the pop-up menu in the top-right corner of the Info window. To customize the color, choose Other, and then make your color selections in the Colors window.