[Ceiling_paint]

well, you don't really have to make it say anything, it shouldn't be readable if it's the right font, its like arabic, or wingdings, its all just symbols

you won't be able to read it unless you're a REAL geek, so you can make it say anything you want, secret message to the aliens, sublimonal message to do a backflip, doesn't matter, a jumble of letters would even work