While test-driving the new Gnome 2.28 desktop, I was surprised to see that
among the default backgrounds, there was a "Cosmos" slide-show of several
cosmic pictures of space that regularly transition on your desktop.
While I had used this feature in the past when using KDE, I was not aware of
how to create my own slide-show backgrounds in Gnome. By examining how the
Cosmos slide-show works, I figured out how to create my own custom
slide-show backgrounds. Read on and find out to create your own
custom desktop background.