Lightning Strikes Twice (In Camera Light Painting), Bohinj Jezero, a photo by flatworldsedge on Flickr.
Via Flickr:
Light painting in Bohinj Lake, whilst a lightning storms plays across the surrounding peaks of the Triglav National Park. The white balance is as shot - the lightning picking out the distant peaks in a curious purple glow.
Wading out to the little rocky island to light paint, whilst the thunder and lightning bounced around the surrounding hills, was a slightly nervous endeavour, but worth it for the result.
Full write up on Flickr - click the main image to reach.