These are cool - when I first heard there was a Shadow pinball I thought maybe it'd be from the Howard Chaykin era. I read his Shadow comics and loved his artwork. In case you haven't seen his work, here's a link to a Google Image Search of it:
https://www.google.com/search?q=howard+chaykin+shadow&tbm=isch&tbo=u&source=univ&sa=X&ei=EoMFUpwlhZDJAbPNgWg&ved=0CC4QsAQ&biw=1376&bih=712