Having spoken to a bunch of Stanford admits, listened to DB talk about some topics admits wrote and penned a response last year, I thought I might share some random thoughts on essay one.
1. The diversity of topics people choose is HUGE. If you think everyone writes about 'saving the world' / 'microfinance in Africa'-style topics you are wrong.
2. Don't worry about the 'what' being original because it probably won't be. Family, pet, child, personality trait, TV show, board game, instrument etc - it's all been done. There are no points for an original 'what'.
3. Don't be boring. Your essay can be about family without starting "my family is what matters most." However, gimmicks are lame. If your essay is about family being important, your better to basically say that rather than spin a convoluted tale about something silly.
4. Do worry deeply about the 'why'. The 'why' is more important than the what. The 'why' will almost always touch on upbringing, family, or some other defining experience and be inherently unique.
5. Authenticity is key. Relevance to essays B and C is nice, but not at the expense of being authentic.
6. Don't think about what Stanford wants and work backwards.
7. It needn't be a tail of woe, misery and overcoming the odds - but an upward trajectory or some sort of personal development angle is nice.
8. This essay is more about identity than motivation.
lindalibinbin - I actually think all three of those topics could work; even 'negative' traits have a why and could still be good essays. I think you would have to be a pretty good writer to pull it off though.
One thing I found interesting is you mention money and job security is what matters most to everyone deep down, but I actually don't think that's true at all (moving beyond just survival). If you spend a lot of time thinking about job security then potentially there is an interesting underlying 'why' you could delve into?
Happy drafting!