Sustainable Postcard My happiness Our sustainable postcards with the most beautiful illustrations are printed on 350gr ecofriendly paper, so you can easily place these ecofriendly postcards in the living room without a holder or frame. Starting to sell sustainable products in your store or webshop? Start small and start with selling sustainable cards, posters or flower seeds for wildflowers. The sustainable postcards are printed by a printer company in the Netherlands. Standard size postcard (A6) Single card, without envelope Option: Order our envelope made from ecological paper WE LOVE GREEN. Our postcards are printed on FSC paper because we consider a sustainable living environment is important for everyone.