Absolute Write has an piege on how you can spark your writing with article banks. But I wasn't totally sure what article banks were, and maybe you don't either, so let me quote the article:

Article banks (or article submission sites) are websites that allow you to post focused articles on a number of topics on the web for free but you are not paid for the articles. The catch is that the piece can be freely distributed everywhere-- to other websites and e-zines or read and used by anyone as long as he or she leaves the entire article intact including your byline and bio. There are stringent writers' guidelines at the better sites, including format and content restrictions, but certainly nothing I found prohibitive in any way. Guidelines also vary somewhat from one site to another.