Despite my disappointment over the controversy surrounding Cradle to Cradle design principles, I did manage to find one fun C2C product that I plan on using soon:

ReProduct’s Zero Waste Greeting Cards

Made from materials that are healthy for both humans and the environment, ReProduct’s Zero Waste Greeting Cards are 100% reusable. This is how it works: you send a greeting card to your loved one in a two-way envelope. Similar to Netflix, once your loved one is done enjoying the card, they just place it in the postage paid self-addressed return portion of the envelope and drop it in the mail. The card ends up at Shaw Industries, where 100% of the card is reused in the manufacturing of Shaw carpet tiles. Click here for demo.