Boredom is the best way to boost creativity. Forcing yourself to sit in a really boring place without the stimulation of a cell phone or a laptop, and only a pen and a paper, works wonder. Intake of psychoactive drugs, makes you high or low, and thus can help you get started, but is not recommended. Note that I am talking about caffeine, alcohol and nicotine when I say psychoactive drugs. Stronger substances is of course not recommended at all for creative work.