A new Mac application from developers Kevin Lo and Daniel Levi, CarrierEditor, lets you change the carrier logo on your iPhone and iPad quickly and easily. Changing the carrier logo is simple, here's how it works:
To change the logo all you have to do is select the image you want, download the app, input your carrier version from the Settings > About menu, and load the image you selected. CarrierEditor creates the carrier settings file you need to change the carrier logo on your iPhone and iPad via iTunes in a matter of minutes.
The new logo on my iPad and iPhone 5 is a Stormtrooper (pictured at left).