Image overlay pattern comes in very handy when a website has a full screen image or a video as a background. Applying a pattern can make things more readable and easier on eyes. Let's Photoshop.
If you were ever wondering how the heck do they create those continuous patterns, then wonder no more and check this neat Photoshop tutorial that might teach you a new designing trick or two.
Due to work flow optimization guys at Adobe decided to hide some of the filters in Photoshop CS6, if you are missing some of them, you can easily make the visible again.