Writing can be an excellent way to make either a supplemental or a full time income online. And before you say NO! - stop and think about the different options that might be possible (we are not talking about the next New York Times winner here!):
1) Do you have a hobby or special interest? If you are a crafter - could you write directions for a special project, maybe related to a specific season, event or holiday? A guide to getting started in a specific area of interest or tips to find more information on the particular topic?