A free app for Android, by Just4Fun Mobile.

If you want to add a creepy creature to your photo, this is the best application to do it. It allows you to add any of the ghoulish, Halloween-favorite creatures such as famous ghosts, monsters, zombies, etc. You will also be able to change the color of the ghosts and other monsters in the image.

The application is very easy to use. All you have to do is upload your own photo, then inject the nightmarish creature you prefer. You can change the opacity of these ghosts in the image so that they are so much more realistic and spectral.