The above image was created using an online photo mosaic creating service. There are several such services available. Here are some of the best ones.
A Photomosaic is a picture (usually a photograph) that has been divided into (usually equal sized) small rectangular sections, each of which is replaced with another photograph of appropriate average color. When viewed at low magnifications and from a distance, the individual pixels appear as the primary image
clipped from: www.instantfundas.com 