What you are talking about is called: Pareidolia
The Rorschach inkblot test is based on this psychological phenomenon
Apparently, seeing faces, like here:
Psychologists say it is a survival trait....which is why nervous people tend to see them more often (I had not thought of myself as nervous).
I guess that's where my latest song idea came from. Mind you the second photo doesn't take much of an imagination to see.