These are
little images that can appear at the top of your start menu
if you use Windows XP, here is an example..
This is currently the image I’m using on my
computer.
User Image Installation
To add your
new User Image first you need to save the image you want to
use to your own hard drive. Second Click, Start -> Control
Panel -> User Accounts -> Next choose the user account you
want to add your image to, then choose "Change My Picture",
Now browse to the place on your hard drive where you saved
your new image and click Open. You should now have your new
user account image.