That's how I've made a living for years: doing illustrations for comics and magazines. And I'm still doing it. Though I'm really trying to make efforts to have other career choices, because it's just so unstable.
Calvin: Dad where do babies come from? Dad: Well Calvin, you simply go to Sears, buy the kit and follow the assembly instructions. Calvin: I came from Sears? Dad: No you were a blue-light special at K-Mart - almost as good and a lot cheaper!