This app is definitely geared towards a younger audience but that doesn't stop it from actually being super solid in functionality. The fact that it's cross-platform will also make it an enticing app for many so make sure to check it out.
This, and more, is possible with Garble! Send Garbled text messages to any of your contacts. Garble is available on BlackBerry, and other phones so no contact is left out. Your messages are kept on your phone only; no data is sent to a server or saved anywhere except your phone.
Even your friends who do not have the Garble app can use the free Garble Reader app to read your garbled messages. Customize your garbles, select which contacts can garble with you and so much more.