The question says it all? My quest led me to gravatar. But I am unable to insert a photo/picture of my choice and connect it to my TeX.SX account.
EDIT: I have uploaded a photo at gravatar.com and registered a primary e-mail address. When I log in to TeX.SX using that mail id, I expected that the image would come properly. But it is not happening. Some help here will be appreciated.