Many writers aspire to write, and only write - and that their writing will be able to support their living. A few writers achieve this - those very successful writers who really make their names in their respective niches. I would like to be one of those.
Who wouldn't? Who doesn't?
Anyhow, baby steps of passive income can help realise this dream. My main source of passive income has come from Suite 101. Suite 101 is a content mill that pays perpetual residual income to their writers based on page views and their adsense revenue.
You can literally write what you like, when you like. The "how" is a little complicated, because they have strict guidelines as to the structure, wordcount, word density, etc. But if you follow their informative tutorials, you will learn great tips on how to drive traffic to your articles.
So, in a nutshell - the more, better quality articles you have published with them, the higher your passive income. Maybe you will only earn USD20 per month in the beginning, but it's USD20 more than nothing. Who knows, in a while you may chucking away 20 big G's a month - cetainly gives leeway to concentrate on other things besides work.
[I just received my monthly passive income from them. That's why I'm sharing.] Write for Suite 101, it's a good learning experience.