The inception of Christmas colors being red and green is the Reason we celebrate the holiday in the first place.
It is because of Jesus Christ that we "deck the halls" with red and green.
The green represents Christ's eternal life just as the evergreen trees remain green all winter long. The red represents his blood shed during the crucifixion.
For I consider the sufferings at this present time are not worth comparing with the glory that is to be revealed to us.