Try nokia camera and shoot some images you will be able to resize them or use creative studio
Yes, it looks interesting. Should try it. Thank you !!!Try this app: Phototastic
Phototastic | Windows Phone Apps+Games Store (United States)
The description mentions making Facebook cover and profile frames. I don't use Facebook, so I can't verify this, but this app should work.
Edit: in the app, if you select 'collage' > 1 photo > tap the + to select a picture.
Then tap 'design' > stretch > Facebook. That crops it to the Facebook cover photo size. You can shift and resize the photo within the frame.