Everyone who’s used a jailbroken iPhone before knows what the respring screen looks like. It displays a black screen with a white Apple logo if you have a black device, or a white screen with a black logo if you have a white device. On the other hand, if you’re jailbroken, then why have the same old screen everyone else has? You can customize it!
A new free jailbreak tweak called Springy is going to give you more options to go down this road if you like customization.