On second thoughts, I don't think it is fake.

The first one with the big sheep made of sheep, the legs do look fake but i guess it's possible. The ping pong one does look entirely do-able and the motion of the sheep makes me think it is real. The mona-lisa isn't fake because you get a shot of all the sheep grouped up which would be hard to fake, although the final mona-lisa could be fake. The last one, the fireworks looks the most fake, because it's pitch black and could have been faked quite easily, but I also think that if Chaz says it's possible to make sheep do that, then i'll believe him. Also, becasue the first three look real, why would they make the fourth one fake?

Verdict: REAL!