Another obvious option is for people who enjoy writing. There are countless requests on sites like Elance for all different types of writing. Polish your writing ability and then start bidding on some of these writing jobs. At first, you'll be doing this a few hours a week, but over time, you can build up a dedicated clientele and make a full-time living off your writing.
Note: There are dozens of other survey sites out there. These just happen to be the more well-known ones that have a reputation for paying out in a timely manner and not having impossible standards for cashing out. As always, be careful with your personal information. I recommend using an entirely separate email address for survey sites so they don’t clutter your inbox.
It’s becoming increasingly important for businesses to have a presence on social media. If you have a knack for using social media platforms such as Facebook and Instagram, you could make a living helping businesses reach out, engage and promote their product through social media marketing. Social media managers or specialists also can earn money through training and consulting.