I found this perspective grid on the youtube channel "PeneMenn". He made it and have it available for everybody! Its very cool. I usually dont use perspective grids because I am still learning the fundamentals of perspective but for professionals who know all, may want to check it out.

Also he has cool concept art videos.

Sorry if this thread does not belong here but, well.

Link: http://www.youtube.com/watch?v=k50Eb...1&feature=plcp