Change ICS Lockscreen Icons?

Did you ever get a helpful answer to your question? I also would like to change the aps on the lockscreen.
 
I tried disabling the text app. And making hand cent my default and it receives MMS but does not send them :-! Ideas?
 
I can't disable my text messaging app on my Razr Maxx, it's greyed out. any suggestions on how to disable it?