In  "How Entrepreneurs Can Turn Trash Into Profit (Literally)," Elizabeth Gore gives several examples of entrepreneurs who are already moving in a circle. 

One of them is Norton Point. Based in Martha's Vineyard, MA, they manufacture sunglasses from waste plastics found in the ocean. The company also has what it calls a " One to One Pledge." Norton Point pledges to remove one pound of plastic from the ocean for every pair of sunglasses it sells. It also gives back 5% of its net profits to global cleanup, education, and remediation practices. That certainly meets the definition of a circular economy by being "restorative and regenerative by design."

According to Gore, "Design for recyclability takes into account the entire product lifecycle (including ease of reuse, repair and recycling), finding more efficient materials and means (including use of renewable resources) and looking at new business models that transform processes and relationships." 

Another business she cites is Rubies in the Rubble whose motto is "fighting food waste with relish." They take discarded fruit and vegetable produce which would become waste and turn it into relishes, jams and pickles instead.