I figured out how to make it change every so often with the generic color backgrounds, and thats great and fun. But I forgot how to undo it.
(I know stupid me.)
Plus I would like to know how to make personal pictures my background.
I grew up with , and I just bought one not too long ago and, they really changed the last few years.
System Preferences > Desktop & Screensaver > Change whatever you want.
To get your own pictures cycled put them in a folder, click the + button on the bottom left of the preference pane, and navigate to that folder. I'm sure you can figure out the rest.