A great way to build a community around a blog is to allow the users to personally identify themselves, either as authors or when commenting. Luckily, WordPress has built-in support for user avatars, by using the Gravatar service. Unfortunately, not all users have registered their e-mail address with Gravatar.com and they get stuck with a boring mystery man outline.
Luckily, WordPress allows administrators to change the default Gravatar for users who don't have them, and allows theme authors to provide custom defaults when their theme is active.
You need to have created a WordPress theme containing at least a
style.css file and an
index.php file. Also, you should be using the