Google has dressed up their search results page for the holiday season. All you need to do is search for holiday related searches; such as [christmas],[chanukah], and [kwanzaa]. We reported about the Hanukkah decorations Saturday night since Chanukah was yesterday but all went live I believe on December 1st.
I should note, [festivus] is technically up all year round.
Here are screen shots of the mobile version of each holiday.
Christmas:
Chanukah:
Kwanzaa:
Here are the 2017, 2016, 2015, 2014, 2013, 2012, 2011, 2010 and so on.
Forum discussion at Twitter.