is one of the easiest ways to make money. But it is easy only when you have exceptional writing talent. There are unlimited opportunities available for those who write well. People and companies are continuously looking for content writers, editors and community.
people who can write but they do not have time to pay attention to other aspects of blogging such as designing, monetization, plugins etc. For these people, multi author blogs are the best option. You register with these blogs and write continuously. Your efforts could also help you become the editor of the blog and take part in the administration of the blog. 
here are lots of bloggers holding guest blogging contest at their blog and offering unbelievable cash prizes and other stuff. While most of the things are relevant for bloggers, the cash prizes are truly awesome.