1.) Open
gmail
2.) Click the icon of a person in the upper right hand corner of the page.
3.) Hover over the larger version of this person icon that appears and choose change photo. (sometimes steps one and two need to be repeated before you get to step 3)
4.) You may now upload a photo that you have previously taken or use the webcam option to take a picture from an appropriately equipped computer.
5.) Optionally you can use the creative kit link to alter the photo.