Ridicule can kill innovation. If you laugh at an employee's stupid suggestion or idea they will not attempt to bring you another. Ridicule strangles innovation. The innovation process generates more bad ideas than good ideas. Challenge your people to innovate.
Most employees welcome the opportunity if given the chance.
Recognize a good idea. Acknowledge the idea at a business meeting, give a bonus, write up the idea in a newsletter, etc. Recognition is a major part of promotion. Set the example. If you do not care enough to get yourself out of a rut and 'dinosaur thinking' do not expect your people to innovate.