If you have a spare bedroom, you can find a roommate or list the space on AirBnB for travelers. Having a roommate is the more passive of the two, as being an Airbnb host will require more work in the form of turning over the room between stays. This is a super painless way to earn $500 to $1,000 a month without much effort – you may even be able to cover your mortgage payment with this extra income!
There are so many investments that it’s tough to know what a safe and reliable on is.  Personally, I recommend index funds for this.  An index fund invests in many of the largest 500 companies in America.  Over the last 100 years, and the last 20 years, and the last 10 years, you’re very likely to see a return of about 9 or 10% after fees.  These are much safer investments than buying stock in an individual company.

And while real estate is an excellent option, it does require a significant initial investment, so whether or not this passive income stream is right for you depends on your current financial situation. You might be better off starting with an investment strategy where you can build funds until you have a big enough sum to get involved in real estate.
It takes the “books I’m reading” area you often see in blogs (within Amazon affiliate links) to a whole new level. not only is this great for you, but it’s extremely helpful for your readers who may be looking for additional resources related to your niche. Plus, they may come across products or services they weren’t originally looking for while on your resources page.
I actually spent a year and a half working as an affiliate marketer (mostly selling drumming related products – lessons, kits ect). 5 years on and one of my one page sites (which I’ve not touched) still nets me about $150 a month. I won’t be retiring off that but only really now appreciate the reverse pyramid approach to entrepreneurship (working for nothing initially but later being paid without effort!)
While passive income isn’t always easy to come by, it is possible to create residual revenue streams — even as a beginner. Remember, not all options will make sense for you. And chances are you’ll find one that sounds the most promising. Not sure which that may be? The best way to find out is just to simply get started. Many of the options on this list are free or at least offer a free trial, which gives you a chance to try before you buy!
 @dasjung It sounds like you paid a lot for your education, as did I. But you got to face it, today’s technology allows the average Joe to accomplish a comparable logo with much less effort than you or I could put into it, and the savings outweighs the extra benefit of our knowledge. We, as designers, have been out done. It is time to go back to school, unfortunately… 
Babysitting isn’t just for teens. Everyone from college students to recent retirees can make money watching other people’s children. Word-of-mouth referrals from friends and family are still a great way to get started, but you can also create a profile on Care.com or Sittercity to expand your reach. Note any specialized skills, such as CPR certifications or experience with special needs children, to make yourself more marketable.

You can sell your ebooks through Amazon's Kindle program or Apple's iTunes Connect, which gives you access to a large majority of the digital-book reading market and the barriers for entry are incredibly low. You don't need to invest lots of money to make this happen, but you do need to invest lots of time, not only in writing the ebooks, but in marketing them as well.

That said, lot's of people are making extra money by publishing their own books on Amazon.  For instance, my friend Bob published a few books on Amazon on how to make money blogging and has done very well.  The first book provided basic tips for a small price, but his next book, Pro-Blogging Secrets, is offered at a premium price and he also has an online course.
However, if you're looking for realistic ways you can start earning money online now, then it really truly does boil down to seven paths you can take towards profit. Some will provide you with immediate results, helping you to address your basic monthly necessities such as rent, utilities and groceries, while others have the potential to transform your life by revolutionizing your finances in the long term.
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