Change Windows® 7 Avatar
Windows 7 assigns an Avatar picture to every user. Its a flower icon by default, but you can easily change Windows 7 default image to any other of your liking.
An avatar is basically taken from the Sanskrit word for "a form of self", generally used in many Indian languages is a computer user's picture that represents himself/herself or it is also used in the form of a three-dimensional model used in video games, normally a two-dimensional icon (image) used on Internet forums and other communities, The term "avatar" can also refer to the person connected with the screen name, or handle, of an Internet user.
If you don’t want a user to be recognized as a flower or whatever default image Windows chooses for the account, you can modify the image associated with the account name on the Welcome screen, at the top of the Start menu, and in User Accounts. Clicking the change-picture link shows all the images stored in %AllUsersProfle%\Microsoft\User Account Pictures\Default Pictures, but you’re not limited to those choices. You can download and store more images and click Browse for more pictures. And you can choose any picture in bitmap, GIF, JPEG, or PNG format, such as a picture of yourself or a favorite pet. Windows 7 reduces and crops the picture to fit the picture box
Follow the given instructions to change Windows 7 Avatar:
STEP 1. Open the Start Menu and click Control Panel.
STEP 2. In Control Panel window, select User Accounts and Family Safety.
STEP 3. Click on Change your account picture under the user accounts heading.
STEP 4. Now, you’re ready to change your picture to one of the other standard display avatars by clicking on it. You can also click on Browse for more pictures.
STEP 5. Click on the ‘Change picture’ button in order to bring these changes into effect.
Note: Corresponds with the launch of Windows 7, Microsoft released several Windows 7 Themes. The latest Windows 7 Themes were divided into two categories: Windows 7 Featured Themes and Windows 7 International Themes.