Licensing information for the sample images:
(If you are the author of any of these images and would like them removed, please contact me)
I've adjusted all of the images to be in the 1920x1080 resolution (sorry 4K folks!), and possibly made a few more modifications.

Flower.jpg
https://commons.wikimedia.org/wiki/File:Lotus_flower_(978659).jpg
Author	Hong Zhang
This file is licensed under the Creative Commons Zero license. 
https://creativecommons.org/publicdomain/zero/1.0/deed.en

Aurora.jpg
https://unsplash.com/photos/Oz2ZQ2j8We8
Author	Johny Goerend
This file is licened under the Unsplash License.
https://unsplash.com/license

Paint.jpg
https://unsplash.com/photos/arwTpnIUHdM
Author	Paweł Czerwiński
This file is licened under the Unsplash License.
https://unsplash.com/license

Water.jpg
https://unsplash.com/photos/IXTG1_Tw2dM
Author	Dave Hoefler
This file is licened under the Unsplash License.
https://unsplash.com/license

Blue.jpg
https://unsplash.com/photos/oGjE-6MlGEc
Author	Solen Feyissa
This file is licened under the Unsplash License.
https://unsplash.com/license

Desert.jpg
https://unsplash.com/photos/cNagAGEok9k
Author	Willian Justen de Vasconcellos
This file is licened under the Unsplash License.
https://unsplash.com/license

Jellyfish.jpg
https://unsplash.com/photos/SUwDcVdUGiY
Author	Patrick Boucher
This file is licened under the Unsplash License.
https://unsplash.com/license