This is an easy one. Buy wonderful companies in the stock market that return a portion of their profits back to shareholders. Sure it will take a while for your portfolio to grow. But what else do have going on?
Real estate is a fantastic way to build wealth. You can either buy your primary residence or rental properties. Some people like to invest in real estate through crowdsourcing.
Seriously, you don't have to do anything above your normal everyday shopping to get money back with the right credit card. Just make sure you budget and pay it off every month.
Start writing what you know about an important topic in a blog and get paid for it. It takes a little work but it's not a job exactly. And it's yours.
You can seriously get paid to take surveys. It doesn't pay much but it doesn't take much effort. It's worth a try if you want some extra money.