nice experiment and cool result.
I love double rainbows. the dark band between the primary and secondary arc adds a nice contrast to the color.
excellent use of fast shutter speed. I can just hear the roar of the falls.. looks a bit scary in terms of your perch.
a perfect landscape. the wide angle suits this scene well. and the clouds make the sky a nice part of the picture
3rd place:
Sometimes perfect symmetry is the best in an image. A complete rainbow, end to end....
2nd place:
I like this one for the unusual event it captured. Would have loved to see that.
Winner:
Waterdrops on a CD disk to create prism effects... Very creative and wonderfully psychedelic.