What is Gravatar?
Gravatar is stored by gravatar.com and it is a globally recognized platform associated with the email id registered with wordpress.com. Having a Gravatar gives you online identity across different blogs.
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Steps to Create Gravatar
If you want to create gravatar for your blog you need to follow these steps.
1. You need to visit http://gravatar.com where there is Log In / Sign Up button. You need to click on signup to register with your email id.
2. Verify your email id
3. After following the link you can upload the Pic.
4. You will ask to rate the uploaded Pic.
5. You are done now
Note - You can use multiple images and email addresses to use each different email address and images on different places.