Hi there... I'm not sure if this is what you are looking for but it may help.
Link to tutorial
To have the pastel colors you can just change the opacity on your brush if your following Doug's process, I haven't tried the other way. That's what I did on the sample here. The wall on the left was full opacity, the right side was at 33%. I just did a quick thing over the photo to show you... lol didn't want you to think this was a finished product EEK!
Hope this helps and this is what you were looking for.
