Open up a blog about something you're passionate about. Sell advertising space on said blog when blog gets extremely popular. You really have to build up a fan base and make sure you stick with it. There are many successful bloggers who make six figure incomes and have quit their day job. ProBlogger.com is one of them. If you have a passion about something, perhaps trying to blog about it may work?
I know someone who has his own site and the site easily brings in $100.00 a month in AdSense revenue. This is just a small time site. If this person would put more into it, time, dedication, etc., he could make a lot more.