I've seen a lot of questions in Hometalk's DIY Forum about how to get the white-washed look using paint. Since I did it, I decided to post a tutorial. I just used flat white latex paint and water to make mine and I'll write about what I did. Some of the photo's were "staged" because I didn't take the photos when I did it. I actually did this shortly before I found Hometalk, but I've used my half-done pic many times to show people the difference.
I have Z-Brick on one wall in my living room. It was great when it was in style, but I was sick of it and am not crazy about the look of a painted fireplace so I decided to white-wash it.