We were taking a walk along Boomerang Beach -- one of several phenomenal beaches in this part of the world, and were watching with some trepidation as these storm clouds gathered in the distance. Suddenly a rainbow linked the ocean to the gathering clouds. It was a fleeting moment, and I was lucky I managed to get the camera out of it's case and take a couple of shots.

Post processing was just a slight crop, auto-levels, contrast, hue/saturation and unsharp mask. I tried fooling around with curves, layer masks and the like, but found the simple approach gave the best overal results.