Messages via desktop wallpaper
I've been asked (and done it) by our Literacy co-ord here to produce a There/Their/They're wallpaper for all the students as part of our literacy push, so got me thinking, does anyone else do this (messages on desktop?) and what sort of stuff do you use.
I went through a phase last year of doing a different wallpaper every day with interesting items taken from Wikipedia's "What happened today page" That lasted about a month then got students creating daily Christmas themed backgrounds for December.
So what have you got?