Random Image Generator

I tought of something awesome today, and i want to bring it to life.
Basically, a program that generates all possible 100x100 pixel images (for performance’s sake lets say 32 shades of grey), and only saves the ones that it detected a face/object in.
I wonder what it would spit out… Probably junk, but maybe there would be some gems?
Actually, it would show every possible thing in the universe, in 32 shades of grey, on a 100 x 100 image… right?
What are your thoughts on this, guys?

PS: Im sure there is something similar/identical on the web, but i can’t seem to find it.
PSS: The number of possible combinations would be 32^(100x100)… which is A LOT.