Create apps: There are over a million apps available to both Apple and Android users today. Coming up with a new idea for an app can be nearly impossible so your best bet is most likely to improve upon already existing ideas. Although creating an app is a lot of work, it’s the marketing and sales component that can be the most challenging. See A 12-Step Guide to Building Your Very First Mobile App: Part 1 for a good high-level overview of what it takes to build an app.
Thirsty Affiliates tracks, cloaks, and categorizes your affiliate links. Once you’ve signed up for your program(s) grab your affiliate links and add them to this plugin. This can take time if you will be linking to multiple pages on your affiliate’s website (which in many cases, you should). The pro version comes with statistics but I don’t even use it and I’m quite the analytical person.
I have not personally done this but I would like to eventually. If you are artistic you could make artwork or handmade good such as ornaments, wallets, or jewlery and sell them online. Something that I personally would like to do is design T-shirts and sell them. Shop for anything from creative people everywhere is a great site and I have bought many things from them. If you make quality products and get your name out through Facebook or other social media you could get a substantial business going.