Last year Facebook introduced a new feature: the timeline cover photo. This is the big photo that appears at the top of your Facebook profile page. Some churches, ministries, companies and persons are creating special photos for branding their Facebook account.
Facebook's instructions for adding a cover photo are found here.
The website Depraved Wretch has produced a collection of cover photos that you may freely use on Facebook to share your faith. Here is an example of one of their cover photos: