High quality background, meditation, relaxing, and screensaver type videos with a focus on natural scenes of clouds, stars, moon, trees and nature, as well as some more creative videos using filters and effects. Edits and audio are generally avoided so as to provide a more relaxing and less distracting experience.
I encourage you to make your own playlists to suit your interests. A playlist to fall asleep to, one to have playing in while listening to music, or something to have on during a party are some examples. I invite you to come up with your own and share your uses in the comments section.