If you’re in a competitive industry (and heck, who isn’t?), experiment with a cover photo that shows your company head-to-head with your competition. The flower company Bouqs does this really well. Make note of how they use the words “Other Guys” rather than listing off the name of a specific competitor. This prevents them from looking combative, while still making their point: They’re less expensive than their competitors.
25 Creative Ways to Use Facebook Cover Photos : Social Media Examiner