One of the best things about being a VA is you can pick the things you like to do best. If you have a niche when it comes to blog creation you may be in high demand. Either people have the desire to create blogs or they don't. This is a project they may seek to subcontract out.

Become familiar with blog sites such as blogger.com or wordpress.com and see if you'd like this kind of work.

Are there any subcontractors that would like to focus on this service? Or do already?