Here is one of my current projects, it's a LEGO theme for my iPod.
Using a program called iPodWizard. Make sure to tell them I sent you. (enter Digitalburn for the referal)
I was able to change the images and some of the text on my iPod.
I changed the battery in the upper corner to a brick.
When the iPod is charging it will show a LEGO train go across the screen.
When its fully charged it shows the LEGO train logo.