lol...that's a neat e-card.
The Yule, stolen from the pagans and converted into "Jesus' birthday" is a good time to celebrate lights in the dark days of Winter. So your light theme is appropriate.
Merry Yule and here's to the coming "Easter" too [the old pagan rebirth/resurrection ceremony of the Spring Equinox]..
Those romans were good at repackaing to sell a product, that's for sure. Good old Constantine. Astronomers put Jesus' actual birthday in the Spring or Fall, I forget which..