It's a very simple trick with a photoshop software.....but the result depends how the user can handle it.
Ray found the way to use them for great results.....there are some more on other parts of Ray's web world....check in Ray's Nest the picture from his street, there are some....just awesome....like a Oil picture.
Ray, your style of photo art is different to my way.....but, dam..n, as I said you before.....I like your way.