I need to format a calendar that changes the cell color every two days (for a
total of eight colors) for the entire year of 2009, but I can't find a way to
do it. In other words, the first two days the cells are brown, the second
two days the cells are light blue, the third two days the cells are pink,
fourth = yellow, fifth = dark blue, sixth = light green, seventh = dark
green, and eighth = orange.

Is there a way to do this and repeat it until the end of the year?

For logic purposes, this is for a days' off schedule. There are eight
groups of employees and the groups have two days off for each time their
color lands on the calendar.