Saw something similar to this on Amazon customer submitted images, for the case I just got. Liked it and decided to make one, to fit the "Life Companion" text, clock, date/alarm.
I changed the text message to read, "Authorized Users Only"
then a bit of moving things around to fit. I like the way it turned out. First pic, is the original I saw. 2nd is mine... 3rd image is a blank, if you would like to use.
(Original - Have to love his typos)
(Click on the thumbnail, then right-click image and select View Image and enlarge to full-size)
EDIT: Reposted for correct sizing and added a 3rd, more fitting one, for this day and age.