Foggy Window is a cool application that will turn the surface of your phone screen into a foggy one. This is just like when your bathroom mirror looks like after you have a hot shower, or like your window on a cold winter day. Thus, you can write anything on the surface with your finger, and see it disappearing after a moment.
To fog the screen, you just need to blow the mic, and to clear it, you just need to shake your phone. There are up to nine backgrounds that you can choose. And another thing that makes this app fantastic, you can still play your favorite games with the foggy window.
App price: free