I have recently jumped from the Empire to the Rebel Alliance and got myself Samsung S3 (Provider: O2 (UK)). I have rooted the phone and applied a few very nice ADW themes that I've mixed up using the ADW Launcher. I've now got my phone looking almost how I would like it - except for the provider start and shutdown screens. These are still set to the stock O2 screen and look very much out of place. Is there any reasonably safe way to change these screens? I'm a newbie and still pretty nervous about meddling too much with my phone.

Also, is there any way to skin the icons that appear on the lock screen? These also look out of place and annoy me.