Advanced SMS is designed to replace the stock SMS or Messaging app.
It is still in development but contains basic and some more advanced features.
The look and feel of the app is customisable by changing the colour screen.
Custom notification tones, LED colour (for phones with notification LEDs) and vibrate patterns can be used and I will be adding in at a later stage the abillity to have custom tones and patterns for individual contacts. Any feedback is welcome!