Evil Mad Scientist Laboratories features a tutorial on their site on how to make a micro-readerboard ornament that displays one of 36 short messages, like, ""no peeking at the presents," one letter at a time. To make the holidays even easier, a kit with all the fixin's to make your own LED ornament is available via the Make Store, for $15. Fifteen phrases are included, plus you can enable holiday messages. The kit comes with comic book-style instructions and a preprogrammed microcontroller. Programming isn't required, but you can play around with source code if you want.