I'd like to offer up a humble response to your great question, Casey.
After reading your hubs, I believe you can make some passive income from the very same site through which I make an active income. Yep, I'm talking about (who'da thunk?) eBay.
I don't know beans about what I'm about to share with you, but I still believe it's worth a try and that it won't cost you more than few cents yet establishes mini-streams of income.
Write recipes and sell them over and over again on eBay. I don't know the current rules about electronic transmissions of products. eBay may have stopped that. But what I do know is that I see people still selling recipes. A few minutes of scanning similar items and learning how people are doing it might trigger ideas on how you can tweak your recipes for submission and nominal profits. eBay provides you with pages (if you subscribe to one of their three store options) on which you can write eBay guides. These guides, I believe, can be crawled and spread around the internet by Google. I am NOT a high tech person and may be treading water here, so I'll stop while I'm ahead.
In any event, I wish you the very best, my friend! Aloha!