Picture Flag
All Flags Photo Editor app lets you add the flag of your country to your photo and upload it to FB, as well as share it anywhere you want. started supporting it by adding the flag of your country on their photos.
You can choose a new photo from Gallery, take a new picture from Camera, or Log in to FB and grab your profile picture. The flag of your country will be instantly added, and you can share the edited flagged photo with your friends and show your support
Edit your photo in less than 30 seconds, and share the Picture Flag photo with your friends.
Since FB doesn't allow changing the profile picture directly, you can post it to FB and make that photo with flag your profile picture.