and change into this
So let's get starting:
Open Adobe Photoshop (I was using Adobe Photoshop CS2, if you are using an older version of Photoshop it is possible that you won't be able to make this (I don't know anything about older versions of this particular program).
Open an image of your choice. (Make sure that you aren't making the wall on a blank picture, because you have to draw something in it before you can make the wall (you can also select an area of your choice, if there already is something on it, where you want the wall to be with Rectangle Marquee Tool, Magic Wand or one of the lasso tools)
Select Filter>Sketch>Conte Crayon as displayed below
Adjust the settings as you will. I used the settings shown bellow
When done press OK.
And you get a wall in your image
If you want to post it in forums or your webpage, or anywhere else you must ask my permission!!!