RECRUIT people with crazy and fresh ideas. We need people who think differently from ourselves, and who do not so much think outside the box, as leave the box behind.
They can be attracted internally or externally. However, make sure that you or your leadership team do not interview them, or you will recruit more of the same types of people.
And, having recruited, when you hear about someone doing well, or when a project is delivered, go and thank the person personally. Don’t do it by email. If they are several levels below you (or above you in an upside-down structure!) a face-to-face thank you is even more powerful.