“Chirstmas is doing a little something extra for someone” is a popular Christmas saying that has been printed on many images. American cartoonist Charles M. Schulz (1922-2000) wrote the saying for a Peanuts comic strip that was printed in newspapers in December 1965.
 
   
Wikipedia: Charles M. Schulz
Charles Monroe Schulz (November 26, 1922 – February 12, 2000), nicknamed Sparky, was an American cartoonist best known for the comic strip Peanuts (which featured the characters Charlie Brown and Snoopy, among others). He is widely regarded as one of the most influential cartoonists of all time, cited as a major influence by many later cartoonists, including Calvin and Hobbes creator Bill Watterson.
 
22 December 1965, Seguin (TX) Gazette, pg. I-3, col. 1:
Christmas is doing a little something extra for someone.
(The dog Snoopy looks at his bowl. Someone has filled it with bones.—ed.)
 
22 February 1966, The Sun (San Bernardino, CA), “Holiday Decorations Demonstrated for Club,” pg. A10, col. 3:
Mrs. Herbert Fisher of Flowerland, assisted by Don Copeland presented the program. “Christmas is doing a little something extra for someone,” (...) the speaker said.
 
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[KrazyKorner] Daily Thoughts 12-23-09
FarmHouse Friends
12/23/09
Daily Thoughts
A Time to Think
Christmas is doing a little something extra for someone.—Charles Schulz
 
Google Books
A Little Book of Christmas:
An Abundance of Quotes for the Festive Season
By Alicia Brent
Published by author
2014
Pg. ?:
Christmas is doing a little something extra for someone.
Charles Schulz
 
Google Books
Best Holiday Sweets & Treats:
Good and Simple Family Favorites to Bake and Share
By Daniella Malfitano
The Countryman Press
2016
Pg. ?:
“Christmas is doing a little something extra for someone.” —Charles M. Schulz
 
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Christmas is doing a little something extra for someone. - Charles M. Schulz
7:04 PM - 18 Dec 2016