Edge Hints and Tips
There are lots of creative approaches you can take to make your own grayscale masks to use as photo edges. For example, you can use a filter, such as one of the Sketch group of filters, to alter a texture photo before creating it as a grayscale image.
You can also convert black or white parts of an image to the opposite color so you get a more evenly black or white image to use. To do this, choose Select>Color Range and select either Shadows (darks) or Highlights (lights) in the image. Then replace with the opposite color by selecting it as the background color and press Control+Backspace (Command+Delete on the Mac).
Look out for interesting textures to use on your photos. In addition to photographing them yourself, you can find useful textures at Texture Warehouse, Image After, and Jeremy Engleman’s Public Textures.