No, I'm not talking about the holiday related image that Google always shows on its main search page. I'm talking about the enhancement that Google just made to its image search restricting the search to two new types of images. Here's an example showing only clip art on a search for 'chess Christmas'.
There's nothing particularly Christmasy about any of the images, except Santa in the center image, and there's nothing particularly chessy about that, except the source of the image (www.torontochess.org). Some scrolling and clicking does, however, pick up some images that are both Christmasy and chessy. Here's the URL for the clip art search...
Results 1 - 20 of about 13,500 for chess Christmas.
...Google also released an option for retrieving only line drawings. For the full range of image content types, see Google's Advanced Image Search. And have a Merry Christmas!