How do you make a gimp image your descktop background?

To make a GIMP image your desktop background, open it in GIMP and be sure to save it as a common extension, such as yourfilenamehere.jpg or .gif or .png. If your image is already listed under one of these extensions, you can skip this step.

Note: .xcf files are readable only by GIMP, so will not translate to a desktop image and can't be read by programs such as Mozilla Firefox, Microsoft internet Explorer or Windows Picture and Fax viewer.

Go to your desktop and right click. Select Properties from the drop-down menu and go to Desktop. There will be a list of images, to the right of which is a "Browse" button. Click this button and locate your image. Once you have found it, select it and click OK.

You can now either click "Apply" to apply your new background and see how it looks, keeping the Desktop dialogue open, or you can click OK and the background will apply, closing the desktop dialogue.

I hope this has been helpful for you. =]