Using Blurshot to send pictures you can send a blurred picture to your friends that has to guess what it is before having the picture completely revealed. You can enable the option to show the picture if the user fails to solve it on the time you set.
They will view, guess and laugh and sometimes even cry of frustration they never got the chance to see what you sent them. So get this app downloaded and have your friends work hard for the picture you just sent them.