Props to Jef Maion. http://www.maion.com/photography/iceland/waterfalls.html
"In brief: you can freely use the material on this site under the following conditions ("fair use"):
* The use is of non-commercial nature, for individuals or small not-for-profit organizations.
* You put in place a link below the image to this website with the following anchor text: "(photo subject) photos by photographer Jef Maion", for example "Mountain photos by photographer Jef Maion". The link should point to the gallery index where the image was taken from."
That should do it.
LOTS OF WATER!