This is a great one:
Slinkachu places very little people in different parts of London, and then takes 2 photographs of them, one close-up shot and one shot from a faraway position. It has a really cool effect:
You should really take a look at the rest of them!
Another site was the site of street artist called Mark Jenkins:
See those guys making photographs;)
I might be the only one that finds this funny, but this is just first-class toilet humor! :
They make shit look great!
this video is from the site:
And the last one is Joshua Allen Harris. He has placed animals made out of shopping bags on subway ventilation grates in New York so when a metro passes by, the animal sort of jumps up and comes to life. It looks fantastic:
I love street art!