Here is something pretty cool. There are a couple of threads. One started by the original author and one that branched off of his work. This gives your SMS an entire new look. I personally am following Astronauts thread (a little easier for a noob to understand). But i keep up with the other to try and learn and see what's developing. I am using Win7 skin on my Imagio and it is working for me.
http://forum.xda-developers.com/showthread.php?t=622520
http://forum.xda-developers.com/showthread.php?t=614131
Of course- use it your own risk.
****NOTE**** Forgot to say- in case you don't research- using this will break your MMS. In other words- you will not get picture attachments (i think that is what it means).