At Workiva, a cloud based software company out of Iowa, they have implemented a green prize wheel as tool to recruit more employees. Current employees have the opportunity to spin the wheel every time they refer a new hire to the company. Workiva and many other companies in Iowa have recently struggled to attract new employees. The state currently boasts an unemployment rate of 3.4%.
See "In Iowa, Jobs Are Plentiful but Workers Are Not", Patricia Cohen, The New York Times, January 29, 2016