Today is Columbus Day, and the only search engine to have a special logo or theme up today is Microsoft's Bing. Here is a picture of Bing today, with one "hot spot" highlighted:
Pretty neat theme, background and hot spots. We also, at the Search Engine Roundtable, have a Columbus sailed the ocean blue theme. Here is a picture:
We don't have logos from the other major search engines, such as Google, Yahoo, Ask.com or AOL - but that is not surprising. In fact, last year, Google had a Paddington Bear Doodle on Columbus day.
Forum discussion at Search Engine Roundtable Forums.