This is another Pentax 6x7 shot (Portra 160NC) -- it did a pretty good job of picking up the texture of this agricultural storage tank (which was storing fertilizier, I believe). The color has more to do with the reflection of the blue sky.
Still playing with my new (to me) Pentax 6x7 -- this is a shot of a local water tower using the 55mm lens and Provia 100F. There is something cool about water towers in this part of the country -- sometimes they're almost like a pin in a map to remind you where small towns are.