This photo won an award for underwater photography. It's actually of a walrus attacking its prey, but damn if that doesn't look like a cthulhu-oid beast at the bottom of the sea.
Feel free to use this for your horror games.
In fact, this is a great trigger for a horror game, where the photo makes the news in Greenland (where the photo was taken) and some people have gone mad looking at it. The investigators, of course, know more than they should. While the rest of the world thinks it's a walrus, the PCs know it is something from beyond space and time.