Most people save greeting cards because they treasure the gesture behind them. RecycledIdeas has created greeting cards that you can plant in your garden! These greeting cards are really special because you can plant them in your garden, and remember the sentiment every time you smell the flowers! They will grow all sorts of beautiful flowers or herbs. There is a whole range of sprouting paper products at her Etsy store.
If you need something more professional, check out these Sprouting Business Cards.