FIRST Blogs now has Gravatars.

From gravatar.com:

“A gravatar, or globally recognized avatar, is quite simply an 80×80 pixel avatar image that follows you from weblog to weblog appearing beside your name when you comment on gravatar enabled sites. Avatars help identify your posts on web forums, so why not on weblogs?”

If you leave the image as the default when submitting a new blog the gravatar (if it exists) for the contactEmail (if provided) will be used instead; otherwise, the icon falls back to the standard default.