I don't mind getting mail from strangers, but I think a letters page might be fun too - if players wanted to send a message to everyone, they could send it to you to put on a shared page / pages.
Maybe there would need to be a character limit - but it would be fun to look at a page and see someone said "DONT GO SWAMP" and think "huh? There's a swamp?"
Hahah, I'm thinking of all the weird things you could do with that. Imagine writing in "WATCH OUT FOR THE GROUNDSKEEPER'S DAUGHTER" or something like that, when there in fact is no groundskeeper. Or a daughter.
Ooh, and a variation on the "limited characters" thing could be limited space. Having just 5x4cm to write / draw on, or something - it'd lead to some interesting compressed messages.
