Finished my entry for the round 10 of 2011 championship at autemo.com Went for clean and simple look with this one. I wanted to try out the BMW's frozen grey color, and I think it came out pretty well.
For this one I had a reference picture, it eased the job some.
There are some tutorials on the web, but a full overbrushing tutorials may be harder to find, because that is really a thing you cant teach, you have to try it out yourself and find your own style. Also pretty much every fully brushed car is different, so there isn't just one way to do it.