I was asked by someone if they could use some of my pictures as wallpapers on their phone. I liked the idea and decided I will start publish images every month or two in the right formats to use as smart phone backgrounds and one image to use as desktop backgrounds.
To download an image on your phone (iOS): tap on the picture to open it in full resolution, then tap and hold till you see the menu, choose Save Image. Then change to the photos app and open the picture in Recents. Hit the little share button in the bottom left (Square with an up arrow) and choose Use as Wallpaper.
Here we go with the first set of images
Windows / Mac / Linux desktop Wallpaper