Lots of discussions on this topic and I still suggest the same thing to every newbie who comes here in searching of passive income. Know your strength and sell services. Be the best in what you do and you will get clients based on that.
it seems to me a great majority of the new people that come to the forum do so because they hear about sig campaigns and whatnot; given that, its strange how people only narrow their view to sig campaigns as the sole means of 'earning' bitcoin, as if they've never heard of a job or being paid for a performed task.
I do remember when i started at bitcoin i were doing faucets, i didnt know how bitcoin system worked before, later i tryed signature and since then i were able to accumulate few satoshis and be able to trade, i had bought and sold few coins just after i join this forum. For people like me without any special skill you should consider faucets, social campaigns and signatures in the end, then you can give a try at trading.
even without any marketable skills that are in demand, there's always menial work that people could take up; i've seen plenty of people take up offers for solving captchas for what amounted to pennies. there's always something that can be done, the only ones that say there's no chance bring it on themselves for not seeking out the opportunities.