You could try System Restore to an earlier date before the color change
happened. Start - All Programs - Accessories - System Tools -
If you added a picture to your Desktop I beleive that why your Icon
background color changed.
You can alter the Icon background color to better blend in if you want.
Right click your empty desktop - Properties - Color - Change the color
to blend in.
I had a color change to take place once when I downloaded something.
i need a help on how to restore back the original desktop icons into a colorless backgound text on the icons. even i restore the original desktop themes of my display, there is still blue color on the background of the text in the desktop icons.