Yesterday I promised to catalog the Christmas Day logos from the search industry, when I documented the Christmas eve logos. Some of the logos did not change from day to day. For example, Yahoo has the same logo, Google+'s Jingle is the same and Sogou has a logo for Charlie Chaplin, who was died today on December 25, 1977. But we have new logos from Google, Bing, Baidu, Ask.com and others.
Google Christmas Day Logo:
Google also has a Christmas logo for tomorrow:
Baidu Christmas Day Logo (it's interactive actually):
Dogpile Christmas Day Logo:
Bing Christmas Day Theme:
Ask.com Christmas Day Theme:
Search Engine Roundtable:
Forum discussion at Google Web Search Help.