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Guest book typewriter! - I can't take credit for this idea, but still it's a great one for special occasions (weddings and such) or, better, make it a permanent fixture in the foyer for anyone who should pay you a visit. Especially wonderful if you can find a portable Royal DeLuxe from the 30's!
Guestbook--->>Cute Idea: take blank notebooks and covered them with nicely designed book covers with different questions, like "where do you see us 10 years from now?" or "what's the one thing we should do together in our first year of marriage?"