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.
Here are the 2017, 2016, 2015, 2014, 2013, 2012, 2011, 2010 and so on.
Forum discussion at Twitter.