Doodles are a regular occurrence at Google these days and the company has been running localized doodles for quite some time too. The most obvious examples are the various doodles Google showcases for the national days of the countries it's available in.
Sometimes, Google just paints its logo in the country's flag colors, but sometimes the company puts a little more effort into it.
For example, it's now running a doodle for Romania's
national day. You'll notice a few people dancing in traditional attire, replacing the two 'Os' in Google, an image with a lot of symbolism for most Romanians on this day.
Bing is also doing something for the occasion, running an image of the
Bran Castle in Romania, best known for all of the Dracula related lore.