I don't know if these can be customized, but if they can, what a cool gift for meeting attendees! These beans are lasered to have "Welcome" on the side, so once they sprout, they show the message. How wild would it be to have your logo on something like this? (Click here for more. Via BoingBoing.)
Update: I spoke yesterday with someone from The Promo Shop, which just so happens to carry this item. He said it was really popular with religious groups, as you can have the bean say "faith," or "hope," or other inspirational one-word messages.