Adding ringtones to message

Hi all :-)

How can I add the ringtones to customize sound message?

Thanks!

Pol

1.1.1 got some new sounds for messages.
Don't know about 1.0.2, I think it is possible.

On 1.0.2 i changed my sms ringtone, but what about 1.1.1??
Also will be awesome if we could assign sms ringtones to contacts separately...