XP: Change User Picture Displayed On Welcome Screen
Contributed by David Kirk 
Tagged: Windows How to place a custom picture to symbolize a user on the welcome screen.
The welcome screen in XP is cute and fluffy; we are all fish by default. If you don’t want to be a fish (or any of the other little icons), you may select a unique picture for a user on the welcome screen.
1. Select the Start Menu
2. Select Control Panel
3. Select User Accounts
4. Select the specific account to change
5. Click Change My Picture
6. Click Browse For More Pictures
7. Navigate and select the picture you wish to use and click open
8. You picture will be highlighted. Click Change Picture
You may also like -
XP: Disabling the Welcome Screen / Forcing CTRL+ALT+DEL
Vista: How To Change Picture Associated With Domain Account
XP: Logon Automatically When Starting Windows
Windows: Resetting a Forgotten Password
IE/OE: customize icons, logos and titlebars
How to Boot into Vista's Audit Mode
XP: 5 Windows Logon Registry Hacks
Vista: Screen Saver from Photos and Videos