Paper is still a prime medium of the present, giving value to a concept like these QR code stamps. While stationery, sticky notes and stock business cards remain in use, there's an open opportunity for products like this to marry our digital and printed devices.
A team of designers from the Zhongshan Institute of the University of Electronic Science and Technology in China collaborated on a product that won them a 2014 Red Dot Design Award for innovation. The outcome of their work is a rectangular ink stamp with a transforming pad that produces completely unique QR codes for URLs, contact details and more. You'd use these in conjunction with a synced app that would translate your data into pixelated symbols that could be wirelessly sent to the QR code stamps for imprinting.