Customize the logon screen ?
Yes, when you have your Windows set up to use the logon screen, you can customize the background color. Or you can personalize some more by giving it your favorite image or picture as background image.
To change the background color :
Right-click an empty spot on your desktop
Select "properties"
Click the "appearance" tab
Click the "advanced" button
Click on the "color1" drop-down list and select "other"
Pick the color of your choice and make a note of the red, green and blue values in the lower-right corner of the color dialog box (for instance 128 64 64)
Click "cancel"
In the "advanced appearance" dialog, also click cancel
In the "display properties" dialog, click cancel once more
Then, click the Start button and select "Run"
In the "open" field, type regedit and click ok
In the registry editor, navigate to HKEY_USERS.DEFAULTCONTROL PANELCOLORS and double-click the "background" string. The default value should be 0 78 152, but you can now change it to the values for red, green and blue that you wrote down previously (e.g. 128 64 64). Enter the values in the correct red-green-blue order, separated with a space.
Close the registry editor