Thanks! Worked wonderfully.
It seems like such a small thing, but it makes me VERY happy! I guess I am so used to customizing all my computers, phones... that it was frustrating to not be able to do this with my Kindle.
I used my Mac to perform the update and their were no issues, for anyone who is wondering. I noticed that I had to place the screensavers in the newly created folder after the update was performed, then restart.