The Facebook Background Changer 2 has been published to the chrome store. You can now add your own backgrounds, either by inserting a URL or by dragging a picture from your desktop. All of the original backgrounds from version 1 are still in version 2. Thank you to everyone who gave me feedback on the first version!
New features include:
Drag and drop pictures from your computer
Enter a URL of a picture to set a background
Up to a 3 item history of your old backgrounds
History management - recover old backgrounds or permanently remove them
Optimization for Facebook Timeline (see your background between posts on the timeline)
Features from the original version that were kept in version 2 include:
A menu link inside Facebook to change your background
36 backgrounds that ship with the extension
Settings to control Facebook page's opacity (you can choose how much you want to see your background through Facebook pages)
Icon in the Chrome Toolbar for easy access to change your background