Dark Mountains of Vatnajökull
While heading back onto Route 1 after a stop at Skaftafell, Vatnajökull National Park appeared suddenly engulfed in dark, menacing skies, as if an unearthly storm was brewing. Over the mountains, clouds of black, grey, white and even hints of blue and a red'y-purple danced and merged in high winds.
The scene across the lava field looked spectacular to me. Despite having only just warmed up in the car, I had to get re-dressed for the conditions and capture this picture.
Full disclosure: I drew out some of the red'y-purple colour in the sky in post-shot editing, as this is what I recalled most of the scene in my mind's eye.