All of cover backgrounds are designed carefully so that it give room for your creativity later on the cover editor. The image is free for use on your personal Facebook cover.
If you are looking for commercial use license, please go here:
Free for commercial use Facebook cover background
PS: You can always change the background on the cover editor.
You are on page 54 of Facebook Cover background gallery. Click on your desired background above to start designing and create a unique looking cover.