[nypaulie]

Looks like it's easy to get custom screens for the shutdown/reboot sequences when you press Restart - just replace the following files with your own. (match the size and dimensions)
/usr/share/blanket/shutdown/bg_medium_reboot.png
/usr/share/blanket/splash/bg_medium_defaultbg.png
/var/local/blanket/low_level_screens/images/splash.png

Note: The shutdown & splash directories are read only (ro) so you will have to mount them as "rw" to fiddle with them. PM me for instructions if needed.

[Added 8-23-14]
I got a message from another member regarding this post asking about the "original" splash screen that makes a quick appearance right after the rebooting screen (which he was able to replace with his own). He had located an instance of this graphic here: /opt/amazon/low_level_screens/758x1024/splash.png and thought that this might be the "Main" splash screen. He wrote me telling me this and thought that if it were swapped out it would be gone but was afraid to fiddle with the files and cause brickdom.
I tried replacing that file with one of my own but the original one still makes its brief appearance (the 2nd one shown below). I guess that graphic is not the one to replace - so some more detective work is needed. Anyone want to help? Just need a list of the file locations that have this original splash.png image.
Here are the 4 images that appear on my PW when I do a "Restart". The 3rd image is the one that I swapped with my own thinking it would be the "New" main splash screen, but there must be another one somewhere that gives the 2nd image but I still have not been able to locate it.