Ever find yourself humming a tune, or laying down tracks for yourself or friends? Your next catchy phrase might fetch you a solid passive income stream. On sites like ProductionTrax and Audio Network, musicians can license their compositions for background music in apps, commercials, and websites to earn more money. Read more about this strategy at The Guardian. 

I’m a 45 year old business owner who also has focussed on diversifying my income streams. I have a short term vacation rental in Florida that I bought for $390k in 2012 and net rental income for the last three years has been growing steadily. 2015 I am at $70k gross right now but should end up at $80-85k with net around $45k plus we use the place about 35 nights a year.
John has a daily (yes, daily) podcast where he features an interview with a successful entrepreneur. Now, John enjoys many hundreds of thousands of downloads per month, he’s written a book, has products and has opened up a ton of opportunities for sponsorships and partnerships that wouldn’t have come otherwise. He’s not the first person to have a show dedicated to interviewing rock star entrepreneurs—not even close—but he’s definitely the fastest to see these kinds of results.
Use your base to build your audience, and when you’re starting out, take advantage of the fact that you don’t have a big following to give more personalized help to your first fans. “The people who are starting out — that’s their advantage,” says Flynn. “They have the opportunity to speak directly with those people few coming their way to find out what their problems are and give them the special treatment that bigger brands might not be able to do.”
However, this comes back to the old discussion of pain versus pleasure. We will always do more to avoid pain than we will to gain pleasure. When our backs are against the wall, we act. When they're not, we relax. The truth is that the pain-versus-pleasure paradigm only operates in the short term. We'll only avoid pain in the here and now. Often not in the long term.
Hi Sam! I loved your sentence, “There’s so much information in my head that I need to write it down or else I might explode.” That’s exactly how I feel! I never thought of myself as a writer, and especially not a blogger, but recently I’ve started dabbling in it and it feels so nice to get everything out! I’m dedicated to helping others succeed with personal finances, and there are plenty of “how-to” sites, but it’s important to get people thinking and motivated to prepare, plan, and save! 

If you know anything well, a place, how to fix something, how to make something, how to do something, you can write a guide for it. You can sell your guide as an e-book, offer it as a download for a fee on your site or reach out to bloggers with similar content and ask if they will offer it as a paid download on their website (for a price of course).
As for me, I started focusing on passive income last year, but have owned rentals for 5 years. $25k now outside retirement accounts in mostly real estate. Looking to invest another $500k cash into real estate to get about $65k, and then 1031 under performers next year to hopefully boost that a bit higher. Heavy in real estate, but feels lower risk than the stock market to me if you have cashflowing properties. Real estate is inflation adjusted, and built in cashflow raise when the loan pays off.

A Risk Score of 10 means no risk. A Return Score of 1 means the returns are horrible compared to the risk-free rate. A Feasibility score of 10 means everybody can do it. A Liquidity Score of 1 means it’s very difficult to withdraw your money without a massive penalty. An Activity Score of 10 means you can kick back and do nothing to earn income. To make the ranking as realistic as possible, every score is relative to each other. Furthermore, the return criteria is based off trying to generate $10,000 a year in passive income.
Like I mentioned earlier, coming in late in the game can be an advantage if you listen, learn and provide solutions for what seems to be missing. Even coming into a market with a minimal viable product, you’ll have the advantage of being able to get deep into the customer experience to shape your product or service to what it should be, again, all based on what you’re able to measure and learn.
Non-fiction e-books that educate your potential audience on specific topics like finance, online marketing, and business are going to make you more money than fiction books. Of course, there are always exceptions and you could write the next Harry Potter book, but if you want to create some residual income opportunities quickly, I would suggest you go for what sells first!
Investing in rental properties: Another form of real estate investment, rental investments (i.e. becoming a landlord) could steer you down the passive income path of steady monthly rent checks that you can use to pay off a mortgage loan on the rental property. After the mortgage is paid off, those monthly checks go right into your bank account -- potentially for years to come. 
Even if each patron only contributes a very small amount each month, it can still be a huge source of income. Take a look at the Patreon page for Kinda Funny, an internet video company. They have over 6,209 patrons which means an average of just $3 a month would be a monthly income of almost $19,000 – plus they get cheerleaders that are always happy to spread the word on their brand.
* I use Personal Capital to track all my finances in one place. It’s much easier to use their free software to follow 28 accounts on one platform than to log into various accounts to check my balances. They’ve also got great tools for x-raying your portfolio for excessive fees, recommending a more optimized asset allocation, and planning for retirement with their Retirement Planner.