Practice. Seriously - like most other talents (sports, music, writing etc.) it all comes down to doing a lot of it repeatedly. Start by carrying a notepad, an

Practice. Seriously - like most other talents (sports, music, writing etc.) it all comes down to doing a lot of it repeatedly. Start by carrying a notepad, and noting down anything that pops into your head that could conceivably be an idea - no matter how crap it might seem at first. Keep doing this day by day, and eventually you'll hit upon one that grabs your fancy. Don't stop there though - always keep adding :)