Photoshop/101basics/The Basics/Workspace/menubar/layer/layers effects/patternoverlay

=> Photoshop Tutorials => Photoshop 101 - The Basics 
=> Photoshop Layers Basics ==> Layers Style Effects ==> Pattern Overlay Effect

Pattern Overlay Effect

Blend Mode

Opacity The density of the pattern

Pattern : You can choose between the patterns available

Create Preset You can make the pattern used saved in the pattern's palette

Snap To Origin This would make the pattern snapped to the upper left edge of the layer.

Scale This determines how small or large the use pattern is

Preview : This gives you a preview of how the pattern would be applied.

A sample of the pattern overlay effect