Have you thought of running innovation challenges? They can: solve your most pressing problems increase productivity, reduce costs capture the creative energy of everyone in your organisation They’re engaging, interesting and motivating.
Two types of fear can prevent us from being creative: fears about ourselves fears about how we will be received by other people. ‘Fears about yourself prevent you from doing your best work’ 
If you want a lively discussion get ten of your friends together and ask them to produce a definition of innovation.