several remarkable examples of blending tens of Flickr images which share the same tags (e.g. 'happy' versus 'sad', 'winter' versus 'summer', 'eye', 'circle', etc.). the result is then saved as a new image. the original photos are scaled to match the size of the average image. color levels are adjusted.
similarly, favcol adapts its background color of its web page as flickr's favorite color.

see also Jason Salavon's playboy centerfold averaging.
[flickr.com & flickr.com & favcol.com]