Read some of Plato's quotes. How I get inspiration is a bit complex, if you can control your nervous system(Edit: Not like a monk sitting on needles, but more of activating certain feeling from old experiences.)
Then when I have the feeling going, and I'm energetic I think of certain images. Imagine myself somewhere else. This way I lose contact with my feet kinda, and I'm not concentrating on the things around me. It feels like I'm hovering by the end.
This is when I can launch ideas and images at myself.