for your "slide to unlock text" you want to create a theme (or edit an existing one) and in the *ThemeName.theme/Bundles/com.apple.springboard folder, add a folder named "en.lproj".
Within that folder create a text file named "SpringBoard.strings" then you only need the below
"AWAY_LOCK_LABEL" = "whatever you want"; (including the quotations)
To change the color, it isn't a script, it is actually an image that scrolls behind the text...
Google the stock image for whatever iPhone you are on (iPhone 4 is [email protected], everything else that I am aware is bottombarlocktextmask.png)
edit that png file to whatever color you want and put it in the below folder...
ThemeName.theme/Bundles/com.apple.TelephonyUI