Foto-Mosaik-Edda Creates Stunning Photo Mosaics - Pictures - Lifehacker
http://lifehacker.com/5309234/foto+mosaik+edda-creates-stunning-photo-mosaics

Foto-Mosaik-Edda Creates Stunning Photo Mosaics

How to Create a Mosaic Portrait from a Photograph | Vectortuts+ - http://vector.tutsplus.com/tutorials/illustration/how-to-create-a-mosaic-portrait-from-a-photograph/

Cool resource