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 :)
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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 :)