The CleanTech GroupLogo Design Contest Logo Design Contest Contests / The CleanTech Group The CleanTech Group has selected their winning logo design. For $300 they received 87 designs from 18 different designers from around the world. Find out how LogoTournament works How LogoTournament works Contest Entries by september Return to Contest Return to Contest Withdrawn Prefers others. #35 Withdrawn Prefers others. #34 Discussion september Logo Designer Hi there. Here's my approach. All feedback is appreciated. 13 years ago