With iAlert, you can make UIAlertViews easily. You can use this app to trick your friends into thinking someone send you a text message or just for fun! It also has EMOJI support.🎃🎈🎆❤💚😢😍 Also there's a vibrating (iPhone only) and ringtone function
For EMOJI you need to install and EMOJI Enabler, which is free on Cydia, but paid on the App Store
See larger Screenshots below