No one looks at the world exactly the way you do.  Keep a sketchbook with you so that you can jot down ideas for rendering the moment you have them.

Refill your creative well. When your ideas don't come to you naturally, don't try to force them; you'll only frustrate yourself.  Instead of focusing on yourself, look outward at the things like books, movies, walks, the internet (I would recommend BINGS image search), and conversations with friends. You may be surprised by how spontaneous inspiration you'll find when you're not forcing it!