Okay, I know that they Sydney Opera House is a gross example of roofs, but quite the cool one! We visited the Opera House in Australia in 2009 and what an amazing memory. It is curved, white and MASSIVE!
But here is a little bit more realistic advice on roofing. It is very rare in New England to vary from architectural tile, standing metal seam or wood shakes because of our harsh weather. Anywhere else in the world, it would be a different scenario – that is what defines architecture differences throughout the world.