This Mac tip is provided by Mark Greentree and was originally posted on Mark’s blog – Everyday Mac Support. For more of Mark’s tips visit his site, follow him on Twitter, or browse his archive of posts here.
Have you ever been viewing a website on your Mac and come across a picture you really like?
If you like it enough to save it as your desktop image then all you need to do is right click on the image and proceed down in the menu to Use Image As Desktop Picture.
When you next look at your desktop it will display the picture you have currently selected.
To reset go to System Preferences > Desktop & Screensaver and make sure you are in the Desktop tab. From here you can select the previous background image or another one that is available.