Bidding sites like Rent a Coder and Guru also have a number of job opportunities for Web content writing, although the pay can be rather low.
When a coder produces a video game render, it is a relatively isolated item that can be placed under different contexts.
If you're interested in performing project based freelance writing, you might want to consider registering with Rent A Coder, where you'll search job boards and bid on jobs for clients from all over the world.
There are also websites such as Guru, Rent A Coder, and Get A Freelancer which allow work at home moms to bid on projects of interest.
Sites such as Craig's List, Guru, and Rent a Coder often have ads from people in search of freelance writers, although the pay for many projects tends to be rather low.