Release your inhibitions.
Many times, the fear of failure or creating something that isn't top notch is the only barrier between you and success. Let your insecurities fall by the wayside and create a masterpiece that is divine in your eyes.
If you obstruct your creative process by being too rigid or expecting too much too soon, you'll send your creative juices into hideout indefinitely. Release the pressure and allow your mind to freely express itself.
Paint an abstract painting using colors you generally never use. Choose a topic that's close to your heart and just write the words that come to your mind without editing. Or, doodle in your notepad until an image is just right for your design.