Google Images has a new search option to find huge images only. Besides the known sizes, Small, Medium and Large now there is an Extra Large option too.The extra large images are several thousand pixels each dimension.
For instance, querying for the keyword "google" with this option found a Google logo with the dimensions 3600*1500 pixels. Note that in combination with image sizes, you can restrict your Google Image searches to a specific domain as usual by using the site operator, like site:flickr.com house.
As images continue to improve with the advances in digital photography,it is not a surprise to see Google to make this move.