The makers of My Living Desktop for Mac OS X have released a free version of the app for iOS. Called Shizen: Oceanscapes, it features beautiful high-resolution looped movies of two tranquil scenes with audio on your iPhone or iPad for those who want some relaxation. The apps are ready for Apple's Retina display.
Shizen is the Japanese word for nature. One scene depicts a windswept beach in Washington State. The other is a colorful coral reef that beats any of the computer graphic aquarium variety. You can run the video full screen or in letterbox mode and add a clock. There is a volume control for the natural sounds.