Adding Folds & Creases (in Photoshop)

[pyrandon]

Another method, similar to HR's that Ravs mentions, is this, from Advanced Photoshop issue 32:

• Scan in a folded piece of paper into photoshop & turn it black & white. (You can also get one from this zip file--it's called "Distress.jpg", but please note this is a copyrighted file (see documentation here))
• In your map document, create a new alpha channel and paste the image into it
• select all the white in that channel (or ctrl-click the thumb in the channels window)
• in the layers window, create a new layer on top and fill the selection with a light/pale yellow or green or brown
• drop the opacity of that fill layer down to 80% or so

I hope this helps. I can vouch for the final results--they're cool, although without any displacement. Attached is how this method looks when applied to one of my maps.