A person must be extremely gullible to be able to trick himself, but I manage routinely. If I'm stuck, I make a game of it. Build prompts, play little shell games--like, nullify your natural tendencies by choosing words purely on sound. What connotations have you created? When you were a kid (free from doubt), acts of creation usually centered on some horrible mess. Take something apart, weld it to something else. Is it hideous? That's as good a starting point as any.