Open up the image you want to convert. I chose an image from the stock gallery at stock.xchng.
Press CTRL+A, to select the whole document
Now select the rectangular marquee tool,
And press and hold the alt button, whilst creating this second, inner rectangle. This deselects the area you want as the photo section, so it is not painted over in the next step.
Select an appropriate 'Basic Brush'.
And paint the area you have selected, you should have something like this.
Now go to Edit>Transform>Scale, and re-size it to as you want it, using those little boxes. Then rotate it, by going to Edit>Transform>Rotate.
Now on the layers palette right click the photograph layer, and go to blending options. Apply these settings in drop shadow.
You will have something that looks like this.
By alternating the angle, and skewing some pictures, you will piece together a cool layout like this. I hope you enjoyed this tutorial, as much as I did writing it.
Click to enlarge