1. Yes. I'm almost 100% positive this tutorial works on iOS 6 with the iPhone 5, the only thing you need to do different from that tutorial is that the IMG HEIGHT value needs to be changed to 1136x640 instead of the previous value. Here's the tutorial: http://modmyi.com/forums/wallpaper-v...wallpaper.html
Originally Posted by koreanboybrian
2. Yes. This can be done with LockLauncher from Cydia. I'm not 100% positive that it works on iOS 6, but you can give it a shot.
<IMG HEIGHT="480" WIDTH="320" SRC="images/Wallpaper.gif">