This shot was originally a color hdr, but it seemed like it was lacking something. So, in my processing, I decided to see what the black and white converter in Nik Color Efex would do and it really made it look cool, I think. I like how it made the blue sky really dark. It gives it more of a haunting look.
It's a five bracket jpg exposed at f11 from -2 to +2 exposure values at one stop intervals, merged in Photoshop CS4, tonemapped in Photomatix and tweaked/converted in CS4 using the Nik Color Efex plugin, specifically, pro contrast, tonal contrast, bleach bypass and bw converter.