For any automobile enthusiast using an iPhone, this is certainly heaven. Red Ferrari Enzo Theme via ZodTTD installs using Winterboard and is free to download from Cydia. The theme has a custom wallpaper and a lockscreen that does away with the slider (though you need to slide an imaginary lock to unlock the phone. No sounds, no icons, just the Ferrari Wallpaper.
Repository: ZodTTD | URL: http://zodttd.com/repo/cydia/