Alert Messages & Lockscreen Statursbar BG

[grafagoggel]

Hello,

I'm on making a new Theme for my iPod Touch and I got pretty far. But now I've got 3 Questions:

1. Where can I find the Images for Alert Messages (like 20% Battery). I allready saw it in a Theme but don't know witch one it was.

2. I don't know how to remove the Statusbar Background on the Lockscreen.

3.Is it possible to show the LockscreenWallpaper while charging. That would be nice.

Thanks!

edit: The first pic is just a preview of my theme and the second the alert box I'm talking about.