One thing I always have on hand are business cards- keeping mine in my right hand pocket for easy access to give, and collecting new contacts in my left. If I could be a professional networker, life would be good. At the same time, I am an old fashioned Rolodex person, and have tons of the scraps of paper floating around my desk... Not too green.
Jamie Waiek developed the perfect "green" solution-growing business cards. The project dubbed, "Another Bloomin' Designer" was inspired to have prospective clients keep your business card on their table instead of in their pocket. By dipping one edge in water, after four days a cress or alfalfa plant springs from the top. Its pretty nifty I dare say...!