Ok so I know how to get custom logo's and even a custom recovery screen using pwnage. What you have to do is right click pwnage and view the package contents. Then navigate to contents, resources, then whatever firmware you want to restore with, then you will see 2 files called logo.img2 and recovery.img2 now theses are the images that you see. So im just not sure how to convert a file to .img2, if anyone knows please post here. Then when u get ur custom screen to .img2 then name it correctly and replace the other .img2. Then open pwnage and hit browse ipsw, find it, then click ipsw builder, and build the ipsw with ur custom logo. good luck!