Eco Pen

Pens with replaceable cartridges, like this one, are considered more eco-conscious than normal ballpoints. But this Eco Pen by Acme Studio is a shade or two darker than the usual green, made of cornstarch plastic and biodegradable. In a box of 12 colors for about $24. Go to www.acmestudio.com for a list of retailers. – Rima Suqi