I created the image with just two layers and some opacity fiddling. One image is of the Pacific rim, and the other was made by this gentleman (http://www.pxleyes.com/profile/lchappell/)

I swear I will stab anyone who leaves a comment that says “OMG, I JUST DON’T KNOW.”
And yes, I do realize that this threat will likely prevent such comments from being posted, that is why I issued the threat. But seriously…