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It's really easy!
Go to My Home; to Account; to Change my Theme;
Look for "Browse all themes" and change it to "Create a theme"
Give the theme a name; Click on "Custom Background" yes;
Upload your favorite Chistmas photo; change "centered" to "tiled".
and save the theme.
Have fun!
p.s. You'll get the smoothest results when you size down your picture to something like 900X700.