I'm very much into doTerra essential oils right now. I'd sell those.
I've seen people advertising this on free classifieds online, for as little as $1 per item, depending on the style. They'll add a kids' name, or a team name to an item, etc.
I would sell my artwork. I do that a little bit now, but haven't gotten my website up and running so for now it's just random word of mouth stuff. People are visual, and people expect websites, so I have no exposure at the moment to have it be viable. I would absolutely love to be able to do it full time.