Hello Chet,
Take a look at this posting that gives instructions on how to set/change a back ground image.
https://supportforums.cisco.com/document/44191/how-modifychange-background-image-ip-phone-new
One gotcha that I have ran into before, is the List.xml file needs to be modified in WORD.
To change the background image on a phone from the call manager, you will need to:
->uncheck the option "enable end user to access phone background", under -> Device -> Device settings -> common phone profile. However, when we made this change, all phones restarted and all calls were dropped!!!!!
->Enter background image name in the "background image field" toward the bottom of the phone configuration page. Only name of the image is needed, not the path.
In earlier releases of callmanager you could not change the background image from the ccm. The work around that I used was to use an app called Phonedesigner.
Hope this helps,
if so, please rate.