Considering that you have a finite amount of time, passive income should make up a large part of your work. If you're serious about generating any semblance of income online, then passive income should be one of your sole goals and ambitions. Why? Wouldn't you prefer to do the work one time and get paid repeatedly as opposed to relying on your time to generate that income? Invest the time at the front-end so that you can reap the benefits on the back-end. This means putting in a bit of sweat equity and not getting paid today. Rather, you'll get paid somewhere down the road. And you'll continue getting paid whether you keep building that passive income stream or you stop. 

I know starting a blog is a way to make extra money.  I just wish it was not take so much time it is not easy. To come up with new things to write about plus getting the traffic to your site. Just like your list here no way you just set down and wrote this all at once it took a lot of research and searching your brain.  Great info and thanks for taking the time to put it all together.
Blogging is also one of the cheapest ways to make money online, aside from the time and and intellectual input that you have to invest. As you begin to make money from your blogging efforts, you can easily outsource for greater scalability. I also use Bluehost and I like the fact that it seamlessly integrates or interfaces with WordPress. You can set-up a domain or subdomain in minutes and start blogging in seconds. I love it!
Even if your car rarely goes unused long enough to rent it out to a visiting driver, you can still potentially “rent it out” by turning your vehicle into a rolling advertisement. The site freecarmedia.com pairs car owners with advertisers who are looking for mobile billboards. Drivers can earn up to $400 per month by agreeing to have their vehicle wrapped with a vinyl decal (called a car wrap) provided by an advertiser. Generally, your program will last anywhere from 6 to 24 months, and you get paid for following your normal driving routine.
Do you love getting refunds? How cool would it be to get money back on stuff you’ve already bought? Paribus is a service that lets you find out if stores you’ve shopped at online owe you a refund.  It’s free to sign up. Paribus connects to your email account and checks your receipts.  If they find out a retailer has dropped their price they file a price adjustment claim for you.  Try out Paribus.
However, like anything else truly worthwhile, apps require a significant investment of your time or money upfront. If you don't have the skills, then you have to hire someone who can assist you in creating a great app. But first you need to come up with an idea that will sell. Do the proper market research and analytics to come up with the right app.
 @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… 

Hunt for under-priced used books that you can sell online. Download an app that reads ISBN numbers so you can scan the barcodes on books. This will pull up the book’s current price on Amazon so you can see if it’s worth trying to resell it. Then, visit used book stores, thrift stores, and garage sales to look for high value books. Post the books for sale online using sites like Amazon or Ebay.[9]
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