TranquilityTV (free with in-app purchases) is designed to help you relax with videos of restful places and soothing audio. This universal app is a four-minute sampler of images and sounds before any IAP's.
The company behind the app makes videos for special TV channels in hospitals, and I could see why these scenes would be desirable rather than endless game shows or soap operas which is much of the daily TV fare.
I watched the sampler video, which is basically a compilation, and then tried one of the US$1.99 in-app purchases called High Altitude Meditation. It consists of views of the earth from space, clouds, mountain ranges etc.