How to Make a Collage in Photoshop?
--- To make a collage in Photoshop simply create a template using geometric shapes like squares, rectangles, triangles, etc.
--- Than add your image in a new layer above the collage template. Right click on the image layer and choose Create Clipping Mask.

This action set contains 10 Photoshop actions for creating photo collage:
--- 8 Photoshop collage actions
--- 2 actions with different layer styles

How To Use This Action:
To use this action you have to load the PAT patterns file. Also load the ATN actions file.