I've re-designed the iTunes 10 icon to fit congruently with the style of Quicktime X and other Mac OS 10.6 applications. The icon is available for Mac at 512x512 pixels and PC at 256x256 pixels.
How to install:
Right click on the iTunes app in your Applications folder
Click "Show Package Contents"
Drop the Icns file from the icon folder into "Resources" folder (you may need to type in your password)
Right click on the iTunes desktop icon
Under the "Shortcut" tab choose "Change Icon"
Find the Ico file in the folder and hit "Ok"