With a bit of imagination or creativity we can find faces in the common places, like cars, windows, cans, food, walls, trees, clouds, garbage or in and the most surprising places, like a cheese grater. Faces in Places is a blog which collects those images describing itself as A photographic collection of faces found in everyday places. The blog has a Flickr group where you can also share your "faces in places" pictures.

Update: Martin Klasch show me a previous Flickr group with the same theme: Pareidolia. Pareidolia describes a psychological phenomenon involving a vague and random stimulus (often an image or sound) being perceived as significant. Common examples include images of animals or faces in clouds, the man in the moon, and hidden messages on records played in reverse.