You can change your profile photo which will show as a larger format image in the left corner of your page but you can not set a background. There's a lot of speculation as to whether or not Facebook will move brand pages to a timeline-like format with cover art but that's not clear yet.
You can not have a background image on Facebook at this time. It is only a profile pic. that can be added. Also note that the timeline transition is in progress on personal pages. I also have not heard if the transition will involve brand pages. I suppose since the personal Facebook pages will be transitioning to the time line over a span of weeks or even months than users will have to wait for that roll out to be complete before any decisions on business pages are announced.
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