Here's 0Hour1's Twitter post that seems to have started it all:
https://twitter.com/0Hour1/status/650298661159727105/photo/1
0Hour1 also posted on CTH. I think this is all a hoax by 0Hour1, but that's just based on blog comments and my own failure to track down a source of the modified image other than 0Hour1.
If it is a hoax, it seems to have fooled a lot of people, including Gateway Pundit's Jim Hoft. Hoft's page on this subject now shows CNN's denial of responsibility for the photoshopping: