=IF([% Complete]@row = 1, "Green", IF(AND(OR([Start Date]@row > TODAY(), [Start Date]=""), Status@Row="Not Started"),"Blue", IF([End Date]@row < TODAY(), "Red", IF([End Date]@row = TODAY(3), "Yellow", "Green"))))
Red=Not complete by end date
Yellow=Not complete within 3 days of end date
Green = Complete or end date is more than 3 days away
Blue = Start Date is greater than today or there is no start date input yet and status is "Not Started"
Thank you!