From ModMyiFone - Wiki
This page is to post a list of image locations and descriptions on the phone to assist in skinning (you need to know what to change where right :D)
Homescreen
Calculator Icon
/Applications/Calculator.app/icon.png
Maps Icon
/Applications/Maps.app/icon.png
Calendar Icon
/Applications/MobileCal.app/icon.png
Mail Icon
/Applications/MobileMail.app/icon.png
iPod Icon
/Applications/MobileMusicPlayer.app/icon-MediaPlayer.png
Notes Icon
/Applications/MobileNotes.app/icon.png
Phone Icon
/Applications/MobilePhone.app/icon.png
SMS Icon
/Applications/MobileSMS.app/icon.png
Safari Icon
/Applications/MobileSafari.app/icon.png
Camera Icon
/Applications/MobileSlideShow.app/icon-Camera.png
Photos Icon
/Applications/MobileSlideShow.app/icon-Photos.png
Clock Icon
/Applications/MobileTimer.app/icon.png
Settings Icon
/Applications/Preferences.app/icon.png
Stocks Icon
/Applications/Stocks.app/icon.png
Weather Icon
/Applications/Weather.app/icon.png
YouTube Icon
/Applications/YouTube.app/icon.png
App Store Icon
/Applications/AppStore.app/icon.png
Contacts Icon
/Applications/MobileAddressBook.app/icon.png
iTunes Icon
/Applications/MobileStore.app/icon.png
The Dock
/System/Library/CoreServices/SpringBoard.app/SBDockBG2.png
Locked Screen
TelephonyUI.framework has moved in FW 2.0
/System/Library/PrivateFrameworks/TelephonyUI.framework/
Slider Bar
/System/Library/Frameworks/TelephonyUI.framework/bottombarknobgray.png
Unlock Text
/System/Library/Frameworks/TelephonyUI.framework/bottombarlocktextmask.png
Global
Color or picture of ringer background when you used volume keys
/System/Library/CoreServices/SpringBoard.app/hud.png
Alert bubble for calls, sms, etc.
/System/Library/CoreServices/SpringBoard.app/SBBadgeBG.png
Top Background where the signal bar is
/System/Library/CoreServices/SpringBoard.app/FST_BG.png
Battery Charging Screen
Battery Backround
/System/Library/CoreServices/SpringBoard.app/BatteryBG_1.png-BatteryBG_17.png
Top Info Bar (signal strength, battery, etc.)
Carrier Logo
/System/Library/CoreServices/SpringBoard.app/FSO_CARRIER_ATT.png (lighter one)
/System/Library/CoreServices/SpringBoard.app/Default_CARRIER_ATT.png (darker one)
Signal Strength
/System/Library/CoreServices/SpringBoard.app/FSO_0_Bars.png-FSO_5_Bars.png
/System/Library/CoreServices/SpringBoard.app/Default_0_Bars.png-Default_5_Bars.png
Bluetooth
/System/Library/CoreServices/SpringBoard.app/FSO_Bluetooth.png
Background (bar color) HomeScreen
/System/Library/CoreServices/SpringBoard.app/FSO_BG.png
Background (bar color) Lock mode
/System/Library/CoreServices/SpringBoard.app/FST_BG.png
Background (bar color) All other screens (Text, Safari, Mail, etc.)
/System/Library/CoreServices/SpringBoard.app/default_BG.png
WiFi Bars
/System/Library/CoreServices/SpringBoard.app/FSO_0_AirPort.png
/System/Library/CoreServices/SpringBoard.app/FSO_1_AirPort.png
/System/Library/CoreServices/SpringBoard.app/FSO_2_AirPort.png
/System/Library/CoreServices/SpringBoard.app/FSO_3_AirPort.png
/System/Library/CoreServices/SpringBoard.app/Default_0_AirPort.png
/System/Library/CoreServices/SpringBoard.app/Default_1_AirPort.png
/System/Library/CoreServices/SpringBoard.app/Default_2_AirPort.png
/System/Library/CoreServices/SpringBoard.app/Default_3_AirPort.png
EDGE Icons
/System/Library/CoreServices/SpringBoard.app/FSO_EDGE_ON.png
/System/Library/CoreServices/SpringBoard.app/Default_EDGE_ON.png
Power on Screen
The logo (only shows when it starts to minimize)
/System/Library/CoreServices/SpringBoard.app/applelogo.png
Power Off Screen
TelephonyUI.framework has moved in FW 2.0
/System/Library/PrivateFrameworks/TelephonyUI.framework/
Power off slider
System/Library/Frameworks/TelephonyUI.framework/bottombarknobred.png
Calculator
Background
/Applications/Calculator.app/CalculatorBackground.png
Screen Background
/Applications/Calculator.app/LCDBackground.png
iPod
Rating Stars
/Applications/MobileMusicPlayer.app/star_filled.png
Phone
Keypad
/Applications/MobilePhone.app/BarDialer_Sel.png
SMS
Input Field (Bubble where you type you're text message)
/Applications/MobileSMS.app/BalloonInputField.png
Baloon 1 (Bubble where sent text messages are)
/Applications/MobileSMS.app/Baloon_1.png
Baloon 2 (Bubble where recieved text messages are)
/Applications/MobileSMS.app/Baloon_2.png
Bottom Bar Background (Background behing the text input field)
/Applications/MobileSMS.app/MessageEntryBG.png
Safari
Url Bar
Idle
/Applications/MobileSafari.app/Url.png
Inactive
/Applications/MobileSafari.app/UrlInactive.png
Active
/Applications/MobileSafari.app/UrlProgress.png
Mail
Trashcan for deleting mail
/System/Library/PreferenceBundles/MobileMailSettings/trashmbox.png
